Current File : //proc/self/root/opt/alt/python37/share/doc/alt-python37-alembic/docs/_sources/changelog.txt
==========
Changelog
==========
.. changelog::
:version: 0.8.3
:released: October 16, 2015
.. change::
:tags: bug, autogenerate
:tickets: 332
Fixed an 0.8 regression whereby the "imports" dictionary member of
the autogen context was removed; this collection is documented in the
"render custom type" documentation as a place to add new imports.
The member is now known as
:attr:`.AutogenContext.imports` and the documentation is repaired.
.. change::
:tags: bug, batch
:tickets: 333
Fixed bug in batch mode where a table that had pre-existing indexes
would create the same index on the new table with the same name,
which on SQLite produces a naming conflict as index names are in a
global namespace on that backend. Batch mode now defers the production
of both existing and new indexes until after the entire table transfer
operation is complete, which also means those indexes no longer take
effect during the INSERT from SELECT section as well; the indexes
are applied in a single step afterwards.
.. change::
:tags: bug, tests
:pullreq: bitbucket:47
Added "pytest-xdist" as a tox dependency, so that the -n flag
in the test command works if this is not already installed.
Pull request courtesy Julien Danjou.
.. change::
:tags: bug, autogenerate, postgresql
:tickets: 324
Fixed issue in PG server default comparison where model-side defaults
configured with Python unicode literals would leak the "u" character
from a ``repr()`` into the SQL used for comparison, creating an invalid
SQL expression, as the server-side comparison feature in PG currently
repurposes the autogenerate Python rendering feature to get a quoted
version of a plain string default.
.. changelog::
:version: 0.8.2
:released: August 25, 2015
.. change::
:tags: bug, autogenerate
:tickets: 321
Added workaround in new foreign key option detection feature for
MySQL's consideration of the "RESTRICT" option being the default,
for which no value is reported from the database; the MySQL impl now
corrects for when the model reports RESTRICT but the database reports
nothing. A similar rule is in the default FK comparison to accommodate
for the default "NO ACTION" setting being present in the model but not
necessarily reported by the database, or vice versa.
.. changelog::
:version: 0.8.1
:released: August 22, 2015
.. change::
:tags: feature, autogenerate
A custom :paramref:`.EnvironmentContext.configure.process_revision_directives`
hook can now generate op directives within the :class:`.UpgradeOps`
and :class:`.DowngradeOps` containers that will be generated as Python
code even when the ``--autogenerate`` flag is False; provided that
``revision_environment=True``, the full render operation will be run
even in "offline" mode.
.. change::
:tags: bug, autogenerate
Repaired the render operation for the :class:`.ops.AlterColumnOp` object
to succeed when the "existing_type" field was not present.
.. change::
:tags: bug, autogenerate
:tickets: 318
Fixed a regression 0.8 whereby the "multidb" environment template
failed to produce independent migration script segments for the
output template. This was due to the reorganization of the script
rendering system for 0.8. To accommodate this change, the
:class:`.MigrationScript` structure will in the case of multiple
calls to :meth:`.MigrationContext.run_migrations` produce lists
for the :attr:`.MigrationScript.upgrade_ops` and
:attr:`.MigrationScript.downgrade_ops` attributes; each :class:`.UpgradeOps`
and :class:`.DowngradeOps` instance keeps track of its own
``upgrade_token`` and ``downgrade_token``, and each are rendered
individually.
.. seealso::
:ref:`autogen_customizing_multiengine_revision` - additional detail
on the workings of the
:paramref:`.EnvironmentContext.configure.process_revision_directives`
parameter when multiple calls to :meth:`.MigrationContext.run_migrations`
are made.
.. change::
:tags: feature, autogenerate
:tickets: 317
Implemented support for autogenerate detection of changes in the
``ondelete``, ``onupdate``, ``initially`` and ``deferrable``
attributes of :class:`.ForeignKeyConstraint` objects on
SQLAlchemy backends that support these on reflection
(as of SQLAlchemy 1.0.8 currently Postgresql for all four,
MySQL for ``ondelete`` and ``onupdate`` only). A constraint object
that modifies these values will be reported as a "diff" and come out
as a drop/create of the constraint with the modified values.
The fields are ignored for backends which don't reflect these
attributes (as of SQLA 1.0.8 this includes SQLite, Oracle, SQL Server,
others).
.. changelog::
:version: 0.8.0
:released: August 12, 2015
.. change::
:tags: bug, batch
:tickets: 315
Fixed bug in batch mode where the ``batch_op.create_foreign_key()``
directive would be incorrectly rendered with the source table and
schema names in the argument list.
.. change::
:tags: feature, commands
:pullreq: bitbucket:46
Added new command ``alembic edit``. This command takes the same
arguments as ``alembic show``, however runs the target script
file within $EDITOR. Makes use of the ``python-editor`` library
in order to facilitate the handling of $EDITOR with reasonable
default behaviors across platforms. Pull request courtesy
Michel Albert.
.. change::
:tags: feature, commands
:tickets: 311
Added new multiple-capable argument ``--depends-on`` to the
``alembic revision`` command, allowing ``depends_on`` to be
established at the command line level rather than having to edit
the file after the fact. ``depends_on`` identifiers may also be
specified as branch names at the command line or directly within
the migration file. The values may be specified as partial
revision numbers from the command line which will be resolved to
full revision numbers in the output file.
.. change::
:tags: change, operations
A range of positional argument names have been changed to be
clearer and more consistent across methods within the
:class:`.Operations` namespace. The most prevalent form of name change
is that the descriptive names ``constraint_name`` and ``table_name``
are now used where previously the name ``name`` would be used.
This is in support of the newly modularized and extensible system of
operation objects in :mod:`alembic.operations.ops`.
An argument translation layer is in place
across the ``alembic.op`` namespace that will ensure that named
argument calling styles that use the old names will continue to
function by transparently translating to the new names,
also emitting a warning. This, along with the fact that these
arguments are positional in any case and aren't normally
passed with an explicit name, should ensure that the
overwhelming majority of applications should be unaffected by this
change. The *only* applications that are impacted are those that:
1. use the :class:`.Operations` object directly in some way, rather
than calling upon the ``alembic.op`` namespace, and
2. invoke the methods on :class:`.Operations` using named keyword
arguments for positional arguments like ``table_name``,
``constraint_name``, etc., which commonly were named ``name``
as of 0.7.6.
3. any application that is using named keyword arguments in place
of positional argument for the recently added
:class:`.BatchOperations` object may also be affected.
The naming changes are documented as "versionchanged" for 0.8.0:
* :meth:`.BatchOperations.create_check_constraint`
* :meth:`.BatchOperations.create_foreign_key`
* :meth:`.BatchOperations.create_index`
* :meth:`.BatchOperations.create_unique_constraint`
* :meth:`.BatchOperations.drop_constraint`
* :meth:`.BatchOperations.drop_index`
* :meth:`.Operations.create_check_constraint`
* :meth:`.Operations.create_foreign_key`
* :meth:`.Operations.create_primary_key`
* :meth:`.Operations.create_index`
* :meth:`.Operations.create_table`
* :meth:`.Operations.create_unique_constraint`
* :meth:`.Operations.drop_constraint`
* :meth:`.Operations.drop_index`
* :meth:`.Operations.drop_table`
.. change::
:tags: feature, tests
The default test runner via "python setup.py test" is now py.test.
nose still works via run_tests.py.
.. change::
:tags: feature, operations
:tickets: 302
The internal system for Alembic operations has been reworked to now
build upon an extensible system of operation objects. New operations
can be added to the ``op.`` namespace, including that they are
available in custom autogenerate schemes.
.. seealso::
:ref:`operation_plugins`
.. change::
:tags: feature, autogenerate
:tickets: 301, 306
The internal system for autogenerate been reworked to build upon
the extensible system of operation objects present in
:ticket:`302`. As part of this change, autogenerate now produces
a full object graph representing a list of migration scripts to
be written as well as operation objects that will render all the
Python code within them; a new hook
:paramref:`.EnvironmentContext.configure.process_revision_directives`
allows end-user code to fully customize what autogenerate will do,
including not just full manipulation of the Python steps to take
but also what file or files will be written and where. Additionally,
autogenerate is now extensible as far as database objects compared
and rendered into scripts; any new operation directive can also be
registered into a series of hooks that allow custom database/model
comparison functions to run as well as to render new operation
directives into autogenerate scripts.
.. seealso::
:ref:`alembic.autogenerate.toplevel`
.. change::
:tags: bug, versioning
:tickets: 314
Fixed bug where in the erroneous case that alembic_version contains
duplicate revisions, some commands would fail to process the
version history correctly and end up with a KeyError. The fix
allows the versioning logic to proceed, however a clear error is
emitted later when attempting to update the alembic_version table.
.. changelog::
:version: 0.7.7
:released: July 22, 2015
.. change::
:tags: bug, versioning
:tickets: 310
Fixed critical issue where a complex series of branches/merges would
bog down the iteration algorithm working over redundant nodes for
millions of cycles. An internal adjustment has been
made so that duplicate nodes are skipped within this iteration.
.. change::
:tags: feature, batch
:tickets: 305
Implemented support for :meth:`.BatchOperations.create_primary_key`
and :meth:`.BatchOperations.create_check_constraint`. Additionally,
table keyword arguments are copied from the original reflected table,
such as the "mysql_engine" keyword argument.
.. change::
:tags: bug, environment
:tickets: 300
The :meth:`.MigrationContext.stamp` method, added as part of the
versioning refactor in 0.7 as a more granular version of
:func:`.command.stamp`, now includes the "create the alembic_version
table if not present" step in the same way as the command version,
which was previously omitted.
.. change::
:tags: bug, autogenerate
:tickets: 298
Fixed bug where foreign key options including "onupdate",
"ondelete" would not render within the ``op.create_foreign_key()``
directive, even though they render within a full
``ForeignKeyConstraint`` directive.
.. change::
:tags: bug, tests
Repaired warnings that occur when running unit tests against
SQLAlchemy 1.0.5 or greater involving the "legacy_schema_aliasing"
flag.
.. changelog::
:version: 0.7.6
:released: May 5, 2015
.. change::
:tags: feature, versioning
:tickets: 297
Fixed bug where the case of multiple mergepoints that all
have the identical set of ancestor revisions would fail to be
upgradable, producing an assertion failure. Merge points were
previously assumed to always require at least an UPDATE in
alembic_revision from one of the previous revs to the new one,
however in this case, if one of the mergepoints has already
been reached, the remaining mergepoints have no row to UPDATE therefore
they must do an INSERT of their target version.
.. change::
:tags: feature, autogenerate
:tickets: 296
Added support for type comparison functions to be not just per
environment, but also present on the custom types themselves, by
supplying a method ``compare_against_backend``.
Added a new documentation section :ref:`compare_types` describing
type comparison fully.
.. change::
:tags: feature, operations
:tickets: 255
Added a new option
:paramref:`.EnvironmentContext.configure.literal_binds`, which
will pass the ``literal_binds`` flag into the compilation of SQL
constructs when using "offline" mode. This has the effect that
SQL objects like inserts, updates, deletes as well as textual
statements sent using ``text()`` will be compiled such that the dialect
will attempt to render literal values "inline" automatically.
Only a subset of types is typically supported; the
:meth:`.Operations.inline_literal` construct remains as the construct
used to force a specific literal representation of a value.
The :paramref:`.EnvironmentContext.configure.literal_binds` flag
is added to the "offline" section of the ``env.py`` files generated
in new environments.
.. change::
:tags: bug, batch
:tickets: 289
Fully implemented the
:paramref:`~.Operations.batch_alter_table.copy_from` parameter for
batch mode, which previously was not functioning. This allows
"batch mode" to be usable in conjunction with ``--sql``.
.. change::
:tags: bug, batch
:tickets: 287
Repaired support for the :meth:`.BatchOperations.create_index`
directive, which was mis-named internally such that the operation
within a batch context could not proceed. The create index
operation will proceed as part of a larger "batch table recreate"
operation only if
:paramref:`~.Operations.batch_alter_table.recreate` is set to
"always", or if the batch operation includes other instructions that
require a table recreate.
.. changelog::
:version: 0.7.5
:released: March 19, 2015
.. change::
:tags: bug, autogenerate
:tickets: 266
:pullreq: bitbucket:39
The ``--autogenerate`` option is not valid when used in conjunction
with "offline" mode, e.g. ``--sql``. This now raises a ``CommandError``,
rather than failing more deeply later on. Pull request courtesy
Johannes Erdfelt.
.. change::
:tags: bug, operations, mssql
:tickets: 284
Fixed bug where the mssql DROP COLUMN directive failed to include
modifiers such as "schema" when emitting the DDL.
.. change::
:tags: bug, autogenerate, postgresql
:tickets: 282
Postgresql "functional" indexes are necessarily skipped from the
autogenerate process, as the SQLAlchemy backend currently does not
support reflection of these structures. A warning is emitted
both from the SQLAlchemy backend as well as from the Alembic
backend for Postgresql when such an index is detected.
.. change::
:tags: bug, autogenerate, mysql
:tickets: 276
Fixed bug where MySQL backend would report dropped unique indexes
and/or constraints as both at the same time. This is because
MySQL doesn't actually have a "unique constraint" construct that
reports differently than a "unique index", so it is present in both
lists. The net effect though is that the MySQL backend will report
a dropped unique index/constraint as an index in cases where the object
was first created as a unique constraint, if no other information
is available to make the decision. This differs from other backends
like Postgresql which can report on unique constraints and
unique indexes separately.
.. change::
:tags: bug, commands
:tickets: 269
Fixed bug where using a partial revision identifier as the
"starting revision" in ``--sql`` mode in a downgrade operation
would fail to resolve properly.
As a side effect of this change, the
:meth:`.EnvironmentContext.get_starting_revision_argument`
method will return the "starting" revision in its originally-
given "partial" form in all cases, whereas previously when
running within the :meth:`.command.stamp` command, it would have
been resolved to a full number before passing it to the
:class:`.EnvironmentContext`. The resolution of this value to
a real revision number has basically been moved to a more fundamental
level within the offline migration process.
.. change::
:tags: feature, commands
Added a new feature :attr:`.Config.attributes`, to help with the use
case of sharing state such as engines and connections on the outside
with a series of Alembic API calls; also added a new cookbook section
to describe this simple but pretty important use case.
.. seealso::
:ref:`connection_sharing`
.. change::
:tags: feature, environment
The format of the default ``env.py`` script has been refined a bit;
it now uses context managers not only for the scope of the transaction,
but also for connectivity from the starting engine. The engine is also
now called a "connectable" in support of the use case of an external
connection being passed in.
.. change::
:tags: feature, versioning
:tickets: 267
Added support for "alembic stamp" to work when given "heads" as an
argument, when multiple heads are present.
.. changelog::
:version: 0.7.4
:released: January 12, 2015
.. change::
:tags: bug, autogenerate, postgresql
:tickets: 241
:pullreq: bitbucket:37
Repaired issue where a server default specified without ``text()``
that represented a numeric or floating point (e.g. with decimal places)
value would fail in the Postgresql-specific check for "compare server
default"; as PG accepts the value with quotes in the table specification,
it's still valid. Pull request courtesy Dimitris Theodorou.
.. change::
:tags: bug, autogenerate
:tickets: 259
The rendering of a :class:`~sqlalchemy.schema.ForeignKeyConstraint`
will now ensure that the names of the source and target columns are
the database-side name of each column, and not the value of the
``.key`` attribute as may be set only on the Python side.
This is because Alembic generates the DDL for constraints
as standalone objects without the need to actually refer to an in-Python
:class:`~sqlalchemy.schema.Table` object, so there's no step that
would resolve these Python-only key names to database column names.
.. change::
:tags: bug, autogenerate
:tickets: 260
Fixed bug in foreign key autogenerate where if the in-Python table
used custom column keys (e.g. using the ``key='foo'`` kwarg to
``Column``), the comparison of existing foreign keys to those specified
in the metadata would fail, as the reflected table would not have
these keys available which to match up. Foreign key comparison for
autogenerate now ensures it's looking at the database-side names
of the columns in all cases; this matches the same functionality
within unique constraints and indexes.
.. change::
:tags: bug, autogenerate
:tickets: 261
:pullreq: github:17
Fixed issue in autogenerate type rendering where types that belong
to modules that have the name "sqlalchemy" in them would be mistaken
as being part of the ``sqlalchemy.`` namespace. Pull req courtesy
Bartosz Burclaf.
.. changelog::
:version: 0.7.3
:released: December 30, 2014
.. change::
:tags: bug, versioning
:tickets: 258
Fixed regression in new versioning system where upgrade / history
operation would fail on AttributeError if no version files were
present at all.
.. changelog::
:version: 0.7.2
:released: December 18, 2014
.. change::
:tags: bug, sqlite, autogenerate
Adjusted the SQLite backend regarding autogen of unique constraints
to work fully with the current SQLAlchemy 1.0, which now will report
on UNIQUE constraints that have no name.
.. change::
:tags: bug, batch
:tickets: 254
Fixed bug in batch where if the target table contained multiple
foreign keys to the same target table, the batch mechanics would
fail with a "table already exists" error. Thanks for the help
on this from Lucas Kahlert.
.. change::
:tags: bug, mysql
:tickets: 251
:pullreq: bitbucket:35
Fixed an issue where the MySQL routine to skip foreign-key-implicit
indexes would also catch unnamed unique indexes, as they would be
named after the column and look like the FK indexes. Pull request
courtesy Johannes Erdfelt.
.. change::
:tags: bug, mssql, oracle
:tickets: 253
Repaired a regression in both the MSSQL and Oracle dialects whereby
the overridden ``_exec()`` method failed to return a value, as is
needed now in the 0.7 series.
.. changelog::
:version: 0.7.1
:released: December 3, 2014
.. change::
:tags: bug, batch
The ``render_as_batch`` flag was inadvertently hardcoded to ``True``,
so all autogenerates were spitting out batch mode...this has been
fixed so that batch mode again is only when selected in env.py.
.. change::
:tags: feature, autogenerate
:tickets: 178
:pullreq: bitbucket:32
Support for autogenerate of FOREIGN KEY constraints has been added.
These are delivered within the autogenerate process in the same
manner as UNIQUE constraints, including ``include_object`` support.
Big thanks to Ann Kamyshnikova for doing the heavy lifting here.
.. change::
:tags: feature, batch
Added :paramref:`~.Operations.batch_alter_table.naming_convention`
argument to :meth:`.Operations.batch_alter_table`, as this is necessary
in order to drop foreign key constraints; these are often unnamed
on the target database, and in the case that they are named, SQLAlchemy
is as of the 0.9 series not including these names yet.
.. seealso::
:ref:`dropping_sqlite_foreign_keys`
.. change::
:tags: bug, batch
:pullreq: bitbucket:34
Fixed bug where the "source_schema" argument was not correctly passed
when calling :meth:`.BatchOperations.create_foreign_key`. Pull
request courtesy Malte Marquarding.
.. change::
:tags: bug, batch
:tickets: 249
Repaired the inspection, copying and rendering of CHECK constraints
and so-called "schema" types such as Boolean, Enum within the batch
copy system; the CHECK constraint will not be "doubled" when the table is
copied, and additionally the inspection of the CHECK constraint for
its member columns will no longer fail with an attribute error.
.. change::
:tags: feature, batch
Added two new arguments
:paramref:`.Operations.batch_alter_table.reflect_args`
and :paramref:`.Operations.batch_alter_table.reflect_kwargs`, so that
arguments may be passed directly to suit the
:class:`~.sqlalchemy.schema.Table`
object that will be reflected.
.. seealso::
:ref:`batch_controlling_table_reflection`
.. changelog::
:version: 0.7.0
:released: November 24, 2014
.. change::
:tags: feature, versioning
:tickets: 167
The "multiple heads / branches" feature has now landed. This is
by far the most significant change Alembic has seen since its inception;
while the workflow of most commands hasn't changed, and the format
of version files and the ``alembic_version`` table are unchanged as well,
a new suite of features opens up in the case where multiple version
files refer to the same parent, or to the "base". Merging of
branches, operating across distinct named heads, and multiple
independent bases are now all supported. The feature incurs radical
changes to the internals of versioning and traversal, and should be
treated as "beta mode" for the next several subsequent releases
within 0.7.
.. seealso::
:ref:`branches`
.. change::
:tags: feature, versioning
:tickets: 124
In conjunction with support for multiple independent bases, the
specific version directories are now also configurable to include
multiple, user-defined directories. When multiple directories exist,
the creation of a revision file with no down revision requires
that the starting directory is indicated; the creation of subsequent
revisions along that lineage will then automatically use that
directory for new files.
.. seealso::
:ref:`multiple_version_directories`
.. change::
:tags: feature, operations, sqlite
:tickets: 21
Added "move and copy" workflow, where a table to be altered is copied to
a new one with the new structure and the old one dropped, is now
implemented for SQLite as well as all database backends in general
using the new :meth:`.Operations.batch_alter_table` system. This
directive provides a table-specific operations context which gathers
column- and constraint-level mutations specific to that table, and
at the end of the context creates a new table combining the structure
of the old one with the given changes, copies data from old table to new,
and finally drops the old table,
renaming the new one to the existing name. This is required for
fully featured SQLite migrations, as SQLite has very little support for the
traditional ALTER directive. The batch directive
is intended to produce code that is still compatible with other databases,
in that the "move and copy" process only occurs for SQLite by default,
while still providing some level of sanity to SQLite's
requirement by allowing multiple table mutation operations to
proceed within one "move and copy" as well as providing explicit
control over when this operation actually occurs. The "move and copy"
feature may be optionally applied to other backends as well, however
dealing with referential integrity constraints from other tables must
still be handled explicitly.
.. seealso::
:ref:`batch_migrations`
.. change::
:tags: feature, commands
Relative revision identifiers as used with ``alembic upgrade``,
``alembic downgrade`` and ``alembic history`` can be combined with
specific revisions as well, e.g. ``alembic upgrade ae10+3``, to produce
a migration target relative to the given exact version.
.. change::
:tags: bug, commands
:tickets: 248
The ``alembic revision`` command accepts the ``--sql`` option to
suit some very obscure use case where the ``revision_environment``
flag is set up, so that ``env.py`` is run when ``alembic revision``
is run even though autogenerate isn't specified. As this flag is
otherwise confusing, error messages are now raised if
``alembic revision`` is invoked with both ``--sql`` and
``--autogenerate`` or with ``--sql`` without
``revision_environment`` being set.
.. change::
:tags: bug, autogenerate, postgresql
:tickets: 247
Added a rule for Postgresql to not render a "drop unique" and "drop index"
given the same name; for now it is assumed that the "index" is the
implicit one Postgreql generates. Future integration with
new SQLAlchemy 1.0 features will improve this to be more
resilient.
.. change::
:tags: bug, autogenerate
:tickets: 247
A change in the ordering when columns and constraints are dropped;
autogenerate will now place the "drop constraint" calls *before*
the "drop column" calls, so that columns involved in those constraints
still exist when the constraint is dropped.
.. change::
:tags: feature, commands
New commands added: ``alembic show``, ``alembic heads`` and
``alembic merge``. Also, a new option ``--verbose`` has been
added to several informational commands, such as ``alembic history``,
``alembic current``, ``alembic branches``, and ``alembic heads``.
``alembic revision`` also contains several new options used
within the new branch management system. The output of commands has
been altered in many cases to support new fields and attributes;
the ``history`` command in particular now returns it's "verbose" output
only if ``--verbose`` is sent; without this flag it reverts to it's
older behavior of short line items (which was never changed in the docs).
.. change::
:tags: changed, commands
The ``--head_only`` option to the ``alembic current`` command is
deprecated; the ``current`` command now lists just the version numbers
alone by default; use ``--verbose`` to get at additional output.
.. change::
:tags: feature, config
:pullreq: bitbucket:33
Added new argument :paramref:`.Config.config_args`, allows a dictionary
of replacement variables to be passed which will serve as substitution
values when an API-produced :class:`.Config` consumes the ``.ini``
file. Pull request courtesy Noufal Ibrahim.
.. change::
:tags: bug, oracle
:tickets: 245
The Oracle dialect sets "transactional DDL" to False by default,
as Oracle does not support transactional DDL.
.. change::
:tags: bug, autogenerate
:tickets: 243
Fixed a variety of issues surrounding rendering of Python code that
contains unicode literals. The first is that the "quoted_name" construct
that SQLAlchemy uses to represent table and column names as well
as schema names does not ``repr()`` correctly on Py2K when the value
contains unicode characters; therefore an explicit stringification is
added to these. Additionally, SQL expressions such as server defaults
were not being generated in a unicode-safe fashion leading to decode
errors if server defaults contained non-ascii characters.
.. change::
:tags: bug, operations
:tickets: 174
:pullreq: bitbucket:29
The :meth:`.Operations.add_column` directive will now additionally emit
the appropriate ``CREATE INDEX`` statement if the
:class:`~sqlalchemy.schema.Column` object specifies ``index=True``.
Pull request courtesy David Szotten.
.. change::
:tags: feature, operations
:tickets: 205
The :class:`~sqlalchemy.schema.Table` object is now returned when
the :meth:`.Operations.create_table` method is used. This ``Table``
is suitable for use in subsequent SQL operations, in particular
the :meth:`.Operations.bulk_insert` operation.
.. change::
:tags: feature, autogenerate
:tickets: 203
Indexes and unique constraints are now included in the
:paramref:`.EnvironmentContext.configure.include_object` hook.
Indexes are sent with type ``"index"`` and unique constraints with
type ``"unique_constraint"``.
.. change::
:tags: bug, autogenerate
:tickets: 219
Bound parameters are now resolved as "literal" values within the
SQL expression inside of a CheckConstraint(), when rendering the SQL
as a text string; supported for SQLAlchemy 0.8.0 and forward.
.. change::
:tags: bug, autogenerate
:tickets: 199
Added a workaround for SQLAlchemy issue #3023 (fixed in 0.9.5) where
a column that's part of an explicit PrimaryKeyConstraint would not
have its "nullable" flag set to False, thus producing a false
autogenerate. Also added a related correction to MySQL which will
correct for MySQL's implicit server default of '0' when a NULL integer
column is turned into a primary key column.
.. change::
:tags: bug, autogenerate, mysql
:tickets: 240
Repaired issue related to the fix for #208 and others; a composite
foreign key reported by MySQL would cause a KeyError as Alembic
attempted to remove MySQL's implicitly generated indexes from the
autogenerate list.
.. change::
:tags: bug, autogenerate
:tickets: 28
If the "alembic_version" table is present in the target metadata,
autogenerate will skip this also. Pull request courtesy
Dj Gilcrease.
.. change::
:tags: bug, autogenerate
:tickets: 77
The :paramref:`.EnvironmentContext.configure.version_table`
and :paramref:`.EnvironmentContext.configure.version_table_schema`
arguments are now honored during the autogenerate process, such that
these names will be used as the "skip" names on both the database
reflection and target metadata sides.
.. change::
:tags: changed, autogenerate
:tickets: 229
The default value of the
:paramref:`.EnvironmentContext.configure.user_module_prefix`
parameter is **no longer the same as the SQLAlchemy prefix**.
When omitted, user-defined types will now use the ``__module__``
attribute of the type class itself when rendering in an
autogenerated module.
.. change::
:tags: bug, templates
:tickets: 234
Revision files are now written out using the ``'wb'`` modifier to
``open()``, since Mako reads the templates with ``'rb'``, thus preventing
CRs from being doubled up as has been observed on windows. The encoding
of the output now defaults to 'utf-8', which can be configured using
a newly added config file parameter ``output_encoding``.
.. change::
:tags: bug, operations
:tickets: 230
Added support for use of the :class:`~sqlalchemy.sql.elements.quoted_name`
construct when using the ``schema`` argument within operations. This
allows a name containing a dot to be fully quoted, as well as to
provide configurable quoting on a per-name basis.
.. change::
:tags: bug, autogenerate, postgresql
:tickets: 73
Added a routine by which the Postgresql Alembic dialect inspects
the server default of INTEGER/BIGINT columns as they are reflected
during autogenerate for the pattern ``nextval(<name>...)`` containing
a potential sequence name, then queries ``pg_catalog`` to see if this
sequence is "owned" by the column being reflected; if so, it assumes
this is a SERIAL or BIGSERIAL column and the server default is
omitted from the column reflection as well as any kind of
server_default comparison or rendering, along with an INFO message
in the logs indicating this has taken place. This allows SERIAL/BIGSERIAL
columns to keep the SEQUENCE from being unnecessarily present within
the autogenerate operation.
.. change::
:tags: bug, autogenerate
:tickets: 197, 64, 196
The system by which autogenerate renders expressions within
a :class:`~sqlalchemy.schema.Index`, the ``server_default``
of :class:`~sqlalchemy.schema.Column`, and the
``existing_server_default`` of
:meth:`.Operations.alter_column` has been overhauled to anticipate
arbitrary SQLAlchemy SQL constructs, such as ``func.somefunction()``,
``cast()``, ``desc()``, and others. The system does not, as might
be preferred, render the full-blown Python expression as originally
created within the application's source code, as this would be exceedingly
complex and difficult. Instead, it renders the SQL expression against
the target backend that's subject to the autogenerate, and then
renders that SQL inside of a :func:`~sqlalchemy.sql.expression.text`
construct as a literal SQL string. This approach still has the
downside that the rendered SQL construct may not be backend-agnostic
in all cases, so there is still a need for manual intervention in that
small number of cases, but overall the majority of cases should work
correctly now. Big thanks to Carlos Rivera for pull requests and
support on this.
.. change::
:tags: feature
SQLAlchemy's testing infrastructure is now used to run tests.
This system supports both nose and pytest and opens the way
for Alembic testing to support any number of backends, parallel
testing, and 3rd party dialect testing.
.. change::
:tags: changed, compatibility
Minimum SQLAlchemy version is now 0.7.6, however at least
0.8.4 is strongly recommended. The overhaul of the test suite
allows for fully passing tests on all SQLAlchemy versions
from 0.7.6 on forward.
.. change::
:tags: bug, operations
The "match" keyword is not sent to :class:`.ForeignKeyConstraint`
by :meth:`.Operations.create_foreign_key` when SQLAlchemy 0.7 is in use;
this keyword was added to SQLAlchemy as of 0.8.0.
.. changelog::
:version: 0.6.7
:released: September 9, 2014
.. change::
:tags: bug, mssql
:pullreq: bitbucket:26
Fixed bug in MSSQL dialect where "rename table" wasn't using
``sp_rename()`` as is required on SQL Server. Pull request courtesy
Łukasz Bołdys.
.. change::
:tags: feature
:tickets: 222
Added support for functional indexes when using the
:meth:`.Operations.create_index` directive. Within the list of columns,
the SQLAlchemy ``text()`` construct can be sent, embedding a literal
SQL expression; the :meth:`.Operations.create_index` will perform some hackery
behind the scenes to get the :class:`.Index` construct to cooperate.
This works around some current limitations in :class:`.Index`
which should be resolved on the SQLAlchemy side at some point.
.. changelog::
:version: 0.6.6
:released: August 7, 2014
.. change::
:tags: bug
:tickets: 95
:pullreq: bitbucket:24
A file named ``__init__.py`` in the ``versions/`` directory is now
ignored by Alembic when the collection of version files is retrieved.
Pull request courtesy Michael Floering.
.. change::
:tags: bug
:pullreq: bitbucket:23
Fixed Py3K bug where an attempt would be made to sort None against
string values when autogenerate would detect tables across multiple
schemas, including the default schema. Pull request courtesy
paradoxxxzero.
.. change::
:tags: bug
:pullreq: github:15
Autogenerate render will render the arguments within a Table construct
using ``*[...]`` when the number of columns/elements is greater than
255. Pull request courtesy Ryan P. Kelly.
.. change::
:tags: bug
:pullreq: github:14
Fixed bug where foreign key constraints would fail to render in
autogenerate when a schema name was present. Pull request courtesy
Andreas Zeidler.
.. change::
:tags: bug
:tickets: 212
Some deep-in-the-weeds fixes to try to get "server default" comparison
working better across platforms and expressions, in particular on
the Postgresql backend, mostly dealing with quoting/not quoting of various
expressions at the appropriate time and on a per-backend basis.
Repaired and tested support for such defaults as Postgresql interval
and array defaults.
.. change::
:tags: enhancement
:tickets: 209
When a run of Alembic command line fails due to ``CommandError``,
the output now prefixes the string with ``"FAILED:"``, and the error
is also written to the log output using ``log.error()``.
.. change::
:tags: bug
:tickets: 208
Liberalized even more the check for MySQL indexes that shouldn't be
counted in autogenerate as "drops"; this time it's been reported
that an implicitly created index might be named the same as a composite
foreign key constraint, and not the actual columns, so we now skip those
when detected as well.
.. change::
:tags: feature
:pullreq: github:10
Added a new accessor :attr:`.MigrationContext.config`, when used
in conjunction with a :class:`.EnvironmentContext` and
:class:`.Config`, this config will be returned. Patch
courtesy Marc Abramowitz.
.. changelog::
:version: 0.6.5
:released: May 3, 2014
.. change::
:tags: bug, autogenerate, mysql
:tickets: 202
This releases' "autogenerate index detection" bug, when a MySQL table
includes an Index with the same name as a column, autogenerate reported
it as an "add" even though its not; this is because we ignore reflected
indexes of this nature due to MySQL creating them implicitly. Indexes
that are named the same as a column are now ignored on
MySQL if we see that the backend is reporting that it already exists;
this indicates that we can still detect additions of these indexes
but not drops, as we cannot distinguish a backend index same-named
as the column as one that is user generated or mysql-generated.
.. change::
:tags: feature, environment
:tickets: 201
Added new feature :paramref:`.EnvironmentContext.configure.transaction_per_migration`,
which when True causes the BEGIN/COMMIT pair to incur for each migration
individually, rather than for the whole series of migrations. This is
to assist with some database directives that need to be within individual
transactions, without the need to disable transactional DDL entirely.
.. change::
:tags: bug, autogenerate
:tickets: 200
Fixed bug where the ``include_object()`` filter would not receive
the original :class:`.Column` object when evaluating a database-only
column to be dropped; the object would not include the parent
:class:`.Table` nor other aspects of the column that are important
for generating the "downgrade" case where the column is recreated.
.. change::
:tags: bug, environment
:tickets: 195
Fixed bug where :meth:`.EnvironmentContext.get_x_argument`
would fail if the :class:`.Config` in use didn't actually
originate from a command line call.
.. change::
:tags: bug, autogenerate
:tickets: 194
Fixed another bug regarding naming conventions, continuing
from :ticket:`183`, where add_index()
drop_index() directives would not correctly render the ``f()``
construct when the index contained a convention-driven name.
.. changelog::
:version: 0.6.4
:released: March 28, 2014
.. change::
:tags: bug, mssql
:tickets: 186
Added quoting to the table name when the special EXEC is run to
drop any existing server defaults or constraints when the
:paramref:`.drop_column.mssql_drop_check` or
:paramref:`.drop_column.mssql_drop_default`
arguments are used.
.. change::
:tags: bug, mysql
:tickets: 103
Added/fixed support for MySQL "SET DEFAULT" / "DROP DEFAULT" phrases,
which will now be rendered if only the server default is changing
or being dropped (e.g. specify None to alter_column() to indicate
"DROP DEFAULT"). Also added support for rendering MODIFY rather than
CHANGE when the column name isn't changing.
.. change::
:tags: bug
:tickets: 190
Added support for the ``initially``, ``match`` keyword arguments
as well as dialect-specific keyword arguments to
:meth:`.Operations.create_foreign_key`.
:tags: feature
:tickets: 163
Altered the support for "sourceless" migration files (e.g. only
.pyc or .pyo present) so that the flag "sourceless=true" needs to
be in alembic.ini for this behavior to take effect.
.. change::
:tags: bug, mssql
:tickets: 185
The feature that keeps on giving, index/unique constraint autogenerate
detection, has even more fixes, this time to accommodate database dialects
that both don't yet report on unique constraints, but the backend
does report unique constraints as indexes. The logic
Alembic uses to distinguish between "this is an index!" vs.
"this is a unique constraint that is also reported as an index!" has now
been further enhanced to not produce unwanted migrations when the dialect
is observed to not yet implement get_unique_constraints() (e.g. mssql).
Note that such a backend will no longer report index drops for unique
indexes, as these cannot be distinguished from an unreported unique
index.
.. change::
:tags: bug
:tickets: 183
Extensive changes have been made to more fully support SQLAlchemy's new
naming conventions feature. Note that while SQLAlchemy has added this
feature as of 0.9.2, some additional fixes in 0.9.4 are needed to
resolve some of the issues:
1. The :class:`.Operations` object now takes into account the naming
conventions that are present on the :class:`.MetaData` object that's
associated using :paramref:`~.EnvironmentContext.configure.target_metadata`.
When :class:`.Operations` renders a constraint directive like
``ADD CONSTRAINT``, it now will make use of this naming convention
when it produces its own temporary :class:`.MetaData` object.
2. Note however that the autogenerate feature in most cases generates
constraints like foreign keys and unique constraints with the
final names intact; the only exception are the constraints implicit
with a schema-type like Boolean or Enum. In most of these cases,
the naming convention feature will not take effect for these constraints
and will instead use the given name as is, with one exception....
3. Naming conventions which use the ``"%(constraint_name)s"`` token, that
is, produce a new name that uses the original name as a component,
will still be pulled into the naming convention converter and be
converted. The problem arises when autogenerate renders a constraint
with it's already-generated name present in the migration file's source
code, the name will be doubled up at render time due to the combination
of #1 and #2. So to work around this, autogenerate now renders these
already-tokenized names using the new :meth:`.Operations.f` component.
This component is only generated if **SQLAlchemy 0.9.4** or greater
is in use.
Therefore it is highly recommended that an upgrade to Alembic 0.6.4
be accompanied by an upgrade of SQLAlchemy 0.9.4, if the new naming
conventions feature is used.
.. seealso::
:ref:`autogen_naming_conventions`
.. change::
:tags: bug
:tickets: 160
Suppressed IOErrors which can raise when program output pipe
is closed under a program like ``head``; however this only
works on Python 2. On Python 3, there is not yet a known way to
suppress the BrokenPipeError warnings without prematurely terminating
the program via signals.
.. change::
:tags: bug
:tickets: 179
Fixed bug where :meth:`.Operations.bulk_insert` would not function
properly when :meth:`.Operations.inline_literal` values were used,
either in --sql or non-sql mode. The values will now render
directly in --sql mode. For compatibility with "online" mode,
a new flag :paramref:`~.Operations.bulk_insert.multiinsert`
can be set to False which will cause each parameter set to be
compiled and executed with individual INSERT statements.
.. change::
:tags: bug, py3k
:tickets: 175
Fixed a failure of the system that allows "legacy keyword arguments"
to be understood, which arose as of a change in Python 3.4 regarding
decorators. A workaround is applied that allows the code to work
across Python 3 versions.
.. change::
:tags: feature
:pullreq: bitbucket:20
The :func:`.command.revision` command now returns the :class:`.Script`
object corresponding to the newly generated revision. From this
structure, one can get the revision id, the module documentation,
and everything else, for use in scripts that call upon this command.
Pull request courtesy Robbie Coomber.
.. changelog::
:version: 0.6.3
:released: February 2, 2014
.. change::
:tags: bug
:tickets: 172
Added a workaround for when we call ``fcntl.ioctl()`` to get at
``TERMWIDTH``; if the function returns zero, as is reported to occur
in some pseudo-ttys, the message wrapping system is disabled in the
same way as if ``ioctl()`` failed.
.. change::
:tags: feature
:tickets: 171
Added new argument
:paramref:`.EnvironmentContext.configure.user_module_prefix`.
This prefix is applied when autogenerate renders a user-defined type,
which here is defined as any type that is from a module outside of the
``sqlalchemy.`` hierarchy. This prefix defaults to ``None``, in
which case the :paramref:`.EnvironmentContext.configure.sqlalchemy_module_prefix`
is used, thus preserving the current behavior.
.. change::
:tags: bug
:tickets: 170
Added support for autogenerate covering the use case where :class:`.Table`
objects specified in the metadata have an explicit ``schema`` attribute
whose name matches that of the connection's default schema
(e.g. "public" for Postgresql). Previously, it was assumed that "schema"
was ``None`` when it matched the "default" schema, now the comparison
adjusts for this.
.. change::
:tags: bug
:pullreq: github:9
The :func:`.compare_metadata` public API function now takes into
account the settings for
:paramref:`.EnvironmentContext.configure.include_object`,
:paramref:`.EnvironmentContext.configure.include_symbol`,
and :paramref:`.EnvironmentContext.configure.include_schemas`, in the
same way that the ``--autogenerate`` command does. Pull
request courtesy Roman Podoliaka.
.. change::
:tags: bug
:tickets: 168
Calling :func:`.bulk_insert` with an empty list will not emit any
commands on the current connection. This was already the case with
``--sql`` mode, so is now the case with "online" mode.
.. change::
:tags: bug
:pullreq: bitbucket:17
Enabled schema support for index and unique constraint autodetection;
previously these were non-functional and could in some cases lead to
attribute errors. Pull request courtesy Dimitris Theodorou.
.. change::
:tags: bug
:tickets: 164
More fixes to index autodetection; indexes created with expressions
like DESC or functional indexes will no longer cause AttributeError
exceptions when attempting to compare the columns.
.. change::
:tags: feature
:tickets: 163
The :class:`.ScriptDirectory` system that loads migration files
from a ``versions/`` directory now supports so-called
"sourceless" operation, where the ``.py`` files are not present
and instead ``.pyc`` or ``.pyo`` files are directly present where
the ``.py`` files should be. Note that while Python 3.3 has a
new system of locating ``.pyc``/``.pyo`` files within a directory
called ``__pycache__`` (e.g. PEP-3147), PEP-3147 maintains
support for the "source-less imports" use case, where the
``.pyc``/``.pyo`` are in present in the "old" location, e.g. next
to the ``.py`` file; this is the usage that's supported even when
running Python3.3.
.. changelog::
:version: 0.6.2
:released: Fri Dec 27 2013
.. change::
:tags: bug
Autogenerate for ``op.create_table()`` will not include a
``PrimaryKeyConstraint()`` that has no columns.
.. change::
:tags: bug
Fixed bug in the not-internally-used :meth:`.ScriptDirectory.get_base`
method which would fail if called on an empty versions directory.
.. change::
:tags: bug
:tickets: 157
An almost-rewrite of the new unique constraint/index autogenerate
detection, to accommodate a variety of issues. The emphasis is on
not generating false positives for those cases where no net change
is present, as these errors are the ones that impact all autogenerate
runs:
* Fixed an issue with unique constraint autogenerate detection where
a named ``UniqueConstraint`` on both sides with column changes would
render with the "add" operation before the "drop", requiring the
user to reverse the order manually.
* Corrected for MySQL's apparent addition of an implicit index
for a foreign key column, so that it doesn't show up as "removed".
This required that the index/constraint autogen system query the
dialect-specific implementation for special exceptions.
* reworked the "dedupe" logic to accommodate MySQL's bi-directional
duplication of unique indexes as unique constraints, and unique
constraints as unique indexes. Postgresql's slightly different
logic of duplicating unique constraints into unique indexes
continues to be accommodated as well. Note that a unique index
or unique constraint removal on a backend that duplicates these may
show up as a distinct "remove_constraint()" / "remove_index()" pair,
which may need to be corrected in the post-autogenerate if multiple
backends are being supported.
* added another dialect-specific exception to the SQLite backend
when dealing with unnamed unique constraints, as the backend can't
currently report on constraints that were made with this technique,
hence they'd come out as "added" on every run.
* the ``op.create_table()`` directive will be auto-generated with
the ``UniqueConstraint`` objects inline, but will not double them
up with a separate ``create_unique_constraint()`` call, which may
have been occurring. Indexes still get rendered as distinct
``op.create_index()`` calls even when the corresponding table was
created in the same script.
* the inline ``UniqueConstraint`` within ``op.create_table()`` includes
all the options like ``deferrable``, ``initially``, etc. Previously
these weren't rendering.
.. change::
:tags: feature, mssql
Added new argument ``mssql_drop_foreign_key`` to
:meth:`.Operations.drop_column`. Like ``mssql_drop_default``
and ``mssql_drop_check``, will do an inline lookup for a
single foreign key which applies to this column, and drop it.
For a column with more than one FK, you'd still need to explicitly
use :meth:`.Operations.drop_constraint` given the name,
even though only MSSQL has this limitation in the first place.
.. change::
:tags: bug, mssql
:pullreq: bitbucket:13
The MSSQL backend will add the batch separator (e.g. ``"GO"``)
in ``--sql`` mode after the final ``COMMIT`` statement, to ensure
that statement is also processed in batch mode. Courtesy
Derek Harland.
.. changelog::
:version: 0.6.1
:released: Wed Nov 27 2013
.. change::
:tags: bug, mysql
:tickets: 152
Fixed bug where :func:`.op.alter_column` in the MySQL dialect
would fail to apply quotes to column names that had mixed casing
or spaces.
.. change::
:tags: feature
:pullreq: bitbucket:12
Expanded the size of the "slug" generated by "revision" to 40
characters, which is also configurable by new field
``truncate_slug_length``; and also split on the word rather than the
character; courtesy Frozenball.
.. change::
:tags: bug
:tickets: 135
Fixed the output wrapping for Alembic message output, so that
we either get the terminal width for "pretty printing" with
indentation, or if not we just output the text as is; in any
case the text won't be wrapped too short.
.. change::
:tags: bug
:pullreq: bitbucket:9
Fixes to Py3k in-place compatibity regarding output encoding and related;
the use of the new io.* package introduced some incompatibilities on Py2k.
These should be resolved, due to the introduction of new adapter types
for translating from io.* to Py2k file types, StringIO types.
Thanks to Javier Santacruz for help with this.
.. change::
:tags: bug
:tickets: 145
Fixed py3k bug where the wrong form of ``next()`` was being called
when using the list_templates command. Courtesy Chris Wilkes.
.. change::
:tags: feature
:tickets: 107
Support for autogeneration detection and rendering of indexes and
unique constraints has been added. The logic goes through some effort
in order to differentiate between true unique constraints and
unique indexes, where there are some quirks on backends like Postgresql.
The effort here in producing the feature and tests is courtesy of IJL.
.. change::
:tags: bug
Fixed bug introduced by new ``include_object`` argument where the
inspected column would be misinterpreted when using a user-defined
type comparison function, causing a KeyError or similar expression-related
error. Fix courtesy Maarten van Schaik.
.. change::
:tags: bug
Added the "deferrable" keyword argument to :func:`.op.create_foreign_key`
so that ``DEFERRABLE`` constraint generation is supported; courtesy
Pedro Romano.
.. change::
:tags: bug
:tickets: 137
Ensured that strings going to stdout go through an encode/decode phase,
so that any non-ASCII characters get to the output stream correctly
in both Py2k and Py3k. Also added source encoding detection using
Mako's parse_encoding() routine in Py2k so that the __doc__ of a
non-ascii revision file can be treated as unicode in Py2k.
.. changelog::
:version: 0.6.0
:released: Fri July 19 2013
.. change::
:tags: feature
:tickets: 101
Added new kw argument to :meth:`.EnvironmentContext.configure`
``include_object``. This is a more flexible version of the
``include_symbol`` argument which allows filtering of columns as well as tables
from the autogenerate process,
and in the future will also work for types, constraints and
other constructs. The fully constructed schema object is passed,
including its name and type as well as a flag indicating if the object
is from the local application metadata or is reflected.
.. change::
:tags: feature
The output of the ``alembic history`` command is now
expanded to show information about each change on multiple
lines, including the full top message,
resembling the formatting of git log.
.. change::
:tags: feature
Added :attr:`alembic.config.Config.cmd_opts` attribute,
allows access to the ``argparse`` options passed to the
``alembic`` runner.
.. change::
:tags: feature
:tickets: 120
Added new command line argument ``-x``, allows extra arguments
to be appended to the command line which can be consumed
within an ``env.py`` script by looking at
``context.config.cmd_opts.x``, or more simply a new
method :meth:`.EnvironmentContext.get_x_argument`.
.. change::
:tags: bug
:tickets: 125
Added support for options like "name" etc. to be rendered
within CHECK constraints in autogenerate. Courtesy
Sok Ann Yap.
.. change::
:tags: misc
Source repository has been moved from Mercurial to Git.
.. change::
:tags: bug
Repaired autogenerate rendering of ForeignKeyConstraint
to include use_alter argument, if present.
.. change::
:tags: feature
Added ``-r`` argument to ``alembic history`` command,
allows specification of ``[start]:[end]`` to view
a slice of history. Accepts revision numbers, symbols
"base", "head", a new symbol "current" representing the
current migration, as well as relative ranges for one
side at a time (i.e. ``-r-5:head``, ``-rcurrent:+3``).
Courtesy Atsushi Odagiri for this feature.
.. change::
:tags: feature
:tickets: 55
Source base is now in-place for Python 2.6 through
3.3, without the need for 2to3. Support for Python 2.5
and below has been dropped. Huge thanks to
Hong Minhee for all the effort on this!
.. changelog::
:version: 0.5.0
:released: Thu Apr 4 2013
.. note::
Alembic 0.5.0 now requires at least
version 0.7.3 of SQLAlchemy to run properly.
Support for 0.6 has been dropped.
.. change::
:tags: feature
:tickets: 76
Added ``version_table_schema`` argument
to :meth:`.EnvironmentContext.configure`,
complements the ``version_table`` argument to
set an optional remote schema for the version
table. Courtesy Christian Blume.
.. change::
:tags: bug, postgresql
:tickets: 32
Fixed format of RENAME for table that includes
schema with Postgresql; the schema name shouldn't
be in the "TO" field.
.. change::
:tags: feature
:tickets: 90
Added ``output_encoding`` option to
:meth:`.EnvironmentContext.configure`,
used with ``--sql`` mode to apply an encoding
to the output stream.
.. change::
:tags: feature
:tickets: 93
Added :meth:`.Operations.create_primary_key`
operation, will genenerate an ADD CONSTRAINT
for a primary key.
.. change::
:tags: bug, mssql
:tickets: 109
Fixed bug whereby double quoting would be applied
to target column name during an ``sp_rename``
operation.
.. change::
:tags: bug, sqlite, mysql
:tickets: 112
transactional_ddl flag for SQLite, MySQL dialects
set to False. MySQL doesn't support it,
SQLite does but current pysqlite driver does not.
.. change::
:tags: feature
:tickets: 115
upgrade and downgrade commands will list the
first line of the docstring out next to the
version number. Courtesy Hong Minhee.
.. change::
:tags: feature
Added --head-only option to "alembic current",
will print current version plus the symbol
"(head)" if this version is the head or not.
Courtesy Charles-Axel Dein.
.. change::
:tags: bug
:tickets: 110
Autogenerate will render additional table keyword
arguments like "mysql_engine" and others within
op.create_table().
.. change::
:tags: feature
:tickets: 108
The rendering of any construct during autogenerate
can be customized, in particular to allow special rendering
for user-defined column, constraint subclasses, using new
``render_item`` argument to
:meth:`.EnvironmentContext.configure`.
.. change::
:tags: bug
Fixed bug whereby create_index()
would include in the constraint columns that
are added to all Table objects using events,
externally to the generation of the constraint.
This is the same issue that was fixed for unique
constraints in version 0.3.2.
.. change::
:tags: bug
Worked around a backwards-incompatible regression in Python3.3
regarding argparse; running "alembic" with no arguments
now yields an informative error in py3.3 as with all previous versions.
Courtesy Andrey Antukh.
.. change::
:tags: change
SQLAlchemy 0.6 is no longer supported by Alembic - minimum version is 0.7.3,
full support is as of 0.7.9.
.. change::
:tags: bug
:tickets: 104
A host of argument name changes within migration
operations for consistency. Keyword arguments
will continue to work on the old name for backwards compatibility,
however required positional arguments will not:
:meth:`.Operations.alter_column` - ``name`` -> ``new_column_name`` - old
name will work for backwards compatibility.
:meth:`.Operations.create_index` - ``tablename`` -> ``table_name`` -
argument is positional.
:meth:`.Operations.drop_index` - ``tablename`` -> ``table_name`` - old
name will work for backwards compatibility.
:meth:`.Operations.drop_constraint` - ``tablename`` -> ``table_name`` -
argument is positional.
:meth:`.Operations.drop_constraint` - ``type`` -> ``type_`` - old
name will work for backwards compatibility
.. changelog::
:version: 0.4.2
:released: Fri Jan 11 2013
.. change::
:tags: bug, autogenerate
:tickets: 99
Fixed bug where autogenerate would fail if a Column
to be added to a table made use of the ".key" paramter.
.. change::
:tags: bug, sqlite
:tickets: 98
The "implicit" constraint generated by a
type such as Boolean or Enum will not generate an
ALTER statement when run on SQlite, which does not
support ALTER for the purpose of adding/removing
constraints separate from the column def itself.
While SQLite supports adding a CHECK constraint
at the column level, SQLAlchemy would need modification
to support this.
A warning is emitted indicating this
constraint cannot be added in this scenario.
.. change::
:tags: bug
:tickets: 96
Added a workaround to setup.py to prevent
"NoneType" error from occuring when
"setup.py test" is run.
.. change::
:tags: bug
:tickets: 96
Added an append_constraint() step to each
condition within
test_autogenerate:AutogenRenderTest.test_render_fk_constraint_kwarg
if the SQLAlchemy version is less than 0.8, as ForeignKeyConstraint
does not auto-append prior to 0.8.
.. change::
:tags: feature
:tickets: 96
Added a README.unittests with instructions for running the test
suite fully.
.. changelog::
:version: 0.4.1
:released: Sun Dec 9 2012
.. change::
:tags: bug
:tickets: 92
Added support for autogenerate render of
ForeignKeyConstraint options onupdate,
ondelete, initially, and deferred.
.. change::
:tags: bug
:tickets: 94
Autogenerate will include "autoincrement=False"
in the rendered table metadata
if this flag was set to false on the source
:class:`.Column` object.
.. change::
:tags: feature
:tickets: 66
Explicit error message describing the case
when downgrade --sql is used without specifying
specific start/end versions.
.. change::
:tags: bug
:tickets: 81
Removed erroneous "emit_events" attribute
from operations.create_table() documentation.
.. change::
:tags: bug
:tickets:
Fixed the minute component in file_template
which returned the month part of the create date.
.. changelog::
:version: 0.4.0
:released: Mon Oct 01 2012
.. change::
:tags: feature
:tickets: 33
Support for tables in alternate schemas
has been added fully to all operations, as well as to
the autogenerate feature. When using autogenerate,
specifying the flag include_schemas=True to
Environment.configure() will also cause autogenerate
to scan all schemas located by Inspector.get_schema_names(),
which is supported by *some* (but not all)
SQLAlchemy dialects including Postgresql.
*Enormous* thanks to Bruno Binet for a huge effort
in implementing as well as writing tests. .
.. change::
:tags: feature
:tickets: 70
The command line runner has been organized
into a reusable CommandLine object, so that other
front-ends can re-use the argument parsing built
in.
.. change::
:tags: feature
:tickets: 43
Added "stdout" option to Config, provides
control over where the "print" output of commands like
"history", "init", "current" etc. are sent.
.. change::
:tags: bug
:tickets: 71
Fixed the "multidb" template which was badly out
of date. It now generates revision files using
the configuration to determine the different
upgrade_<xyz>() methods needed as well, instead of
needing to hardcode these. Huge thanks to
BryceLohr for doing the heavy lifting here.
.. change::
:tags: bug
:tickets: 72
Fixed the regexp that was checking for .py files
in the version directory to allow any .py file through.
Previously it was doing some kind of defensive checking,
probably from some early notions of how this directory
works, that was prohibiting various filename patterns
such as those which begin with numbers.
.. change::
:tags: bug
:tickets:
Fixed MySQL rendering for server_default which
didn't work if the server_default was a generated
SQL expression. Courtesy Moriyoshi Koizumi.
.. change::
:tags: feature
:tickets:
Added support for alteration of MySQL
columns that have AUTO_INCREMENT, as well as enabling
this flag. Courtesy Moriyoshi Koizumi.
.. changelog::
:version: 0.3.6
:released: Wed Aug 15 2012
.. change::
:tags: feature
:tickets: 27
Added include_symbol option to
EnvironmentContext.configure(),
specifies a callable which will include/exclude tables
in their entirety from the autogeneration process
based on name.
.. change::
:tags: feature
:tickets: 59
Added year, month, day, hour, minute, second
variables to file_template.
.. change::
:tags: feature
:tickets:
Added 'primary' to the list of constraint types
recognized for MySQL drop_constraint().
.. change::
:tags: feature
:tickets:
Added --sql argument to the "revision" command,
for the use case where the "revision_environment"
config option is being used but SQL access isn't
desired.
.. change::
:tags: bug
:tickets:
Repaired create_foreign_key() for
self-referential foreign keys, which weren't working
at all.
.. change::
:tags: bug
:tickets: 63
'alembic' command reports an informative
error message when the configuration is missing
the 'script_directory' key.
.. change::
:tags: bug
:tickets: 62
Fixes made to the constraints created/dropped
alongside so-called "schema" types such as
Boolean and Enum. The create/drop constraint logic
does not kick in when using a dialect that doesn't
use constraints for these types, such as postgresql,
even when existing_type is specified to
alter_column(). Additionally, the constraints
are not affected if existing_type is passed but
type\_ is not, i.e. there's no net change
in type.
.. change::
:tags: bug
:tickets: 66
Improved error message when specifiying
non-ordered revision identifiers to cover
the case when the "higher" rev is None,
improved message overall.
.. changelog::
:version: 0.3.5
:released: Sun Jul 08 2012
.. change::
:tags: bug
:tickets: 31
Fixed issue whereby reflected server defaults
wouldn't be quoted correctly; uses repr() now.
.. change::
:tags: bug
:tickets: 58
Fixed issue whereby when autogenerate would
render create_table() on the upgrade side for a
table that has a Boolean type, an unnecessary
CheckConstraint() would be generated.
.. change::
:tags: feature
:tickets:
Implemented SQL rendering for
CheckConstraint() within autogenerate upgrade,
including for literal SQL as well as SQL Expression
Language expressions.
.. changelog::
:version: 0.3.4
:released: Sat Jun 02 2012
.. change::
:tags: bug
:tickets:
Fixed command-line bug introduced by the
"revision_environment" feature.
.. changelog::
:version: 0.3.3
:released: Sat Jun 02 2012
.. change::
:tags: feature
:tickets:
New config argument
"revision_environment=true", causes env.py to
be run unconditionally when the "revision" command
is run, to support script.py.mako templates with
dependencies on custom "template_args".
.. change::
:tags: feature
:tickets:
Added "template_args" option to configure()
so that an env.py can add additional arguments
to the template context when running the
"revision" command. This requires either --autogenerate
or the configuration directive "revision_environment=true".
.. change::
:tags: bug
:tickets: 44
Added "type" argument to op.drop_constraint(),
and implemented full constraint drop support for
MySQL. CHECK and undefined raise an error.
MySQL needs the constraint type
in order to emit a DROP CONSTRAINT.
.. change::
:tags: feature
:tickets: 34
Added version_table argument to
EnvironmentContext.configure(), allowing for the
configuration of the version table name.
.. change::
:tags: feature
:tickets:
Added support for "relative" migration
identifiers, i.e. "alembic upgrade +2",
"alembic downgrade -1". Courtesy
Atsushi Odagiri for this feature.
.. change::
:tags: bug
:tickets: 49
Fixed bug whereby directories inside of
the template directories, such as __pycache__
on Pypy, would mistakenly be interpreted as
files which are part of the template.
.. changelog::
:version: 0.3.2
:released: Mon Apr 30 2012
.. change::
:tags: feature
:tickets: 40
Basic support for Oracle added,
courtesy shgoh.
.. change::
:tags: feature
:tickets:
Added support for UniqueConstraint
in autogenerate, courtesy Atsushi Odagiri
.. change::
:tags: bug
:tickets:
Fixed support of schema-qualified
ForeignKey target in column alter operations,
courtesy Alexander Kolov.
.. change::
:tags: bug
:tickets:
Fixed bug whereby create_unique_constraint()
would include in the constraint columns that
are added to all Table objects using events,
externally to the generation of the constraint.
.. changelog::
:version: 0.3.1
:released: Sat Apr 07 2012
.. change::
:tags: bug
:tickets: 41
bulk_insert() fixes:
1. bulk_insert() operation was
not working most likely since the 0.2 series
when used with an engine.
2. Repaired bulk_insert() to complete when
used against a lower-case-t table and executing
with only one set of parameters, working
around SQLAlchemy bug #2461 in this regard.
3. bulk_insert() uses "inline=True" so that phrases
like RETURNING and such don't get invoked for
single-row bulk inserts.
4. bulk_insert() will check that you're passing
a list of dictionaries in, raises TypeError
if not detected.
.. changelog::
:version: 0.3.0
:released: Thu Apr 05 2012
.. change::
:tags: general
:tickets:
The focus of 0.3 is to clean up
and more fully document the public API of Alembic,
including better accessors on the MigrationContext
and ScriptDirectory objects. Methods that are
not considered to be public on these objects have
been underscored, and methods which should be public
have been cleaned up and documented, including:
MigrationContext.get_current_revision()
ScriptDirectory.iterate_revisions()
ScriptDirectory.get_current_head()
ScriptDirectory.get_heads()
ScriptDirectory.get_base()
ScriptDirectory.generate_revision()
.. change::
:tags: feature
:tickets:
Added a bit of autogenerate to the
public API in the form of the function
alembic.autogenerate.compare_metadata.
.. changelog::
:version: 0.2.2
:released: Mon Mar 12 2012
.. change::
:tags: feature
:tickets:
Informative error message when op.XYZ
directives are invoked at module import time.
.. change::
:tags: bug
:tickets: 35
Fixed inappropriate direct call to
util.err() and therefore sys.exit()
when Config failed to locate the
config file within library usage.
.. change::
:tags: bug
:tickets:
Autogenerate will emit CREATE TABLE
and DROP TABLE directives according to
foreign key dependency order.
.. change::
:tags: bug
:tickets:
implement 'tablename' parameter on
drop_index() as this is needed by some
backends.
.. change::
:tags: feature
:tickets:
Added execution_options parameter
to op.execute(), will call execution_options()
on the Connection before executing.
The immediate use case here is to allow
access to the new no_parameters option
in SQLAlchemy 0.7.6, which allows
some DBAPIs (psycopg2, MySQLdb) to allow
percent signs straight through without
escaping, thus providing cross-compatible
operation with DBAPI execution and
static script generation.
.. change::
:tags: bug
:tickets:
setup.py won't install argparse if on
Python 2.7/3.2
.. change::
:tags: feature
:tickets: 29
script_location can be interpreted
by pkg_resources.resource_filename(), if
it is a non-absolute URI that contains
colons. This scheme is the same
one used by Pyramid.
.. change::
:tags: feature
:tickets:
added missing support for
onupdate/ondelete flags for
ForeignKeyConstraint, courtesy Giacomo Bagnoli
.. change::
:tags: bug
:tickets: 30
fixed a regression regarding an autogenerate
error message, as well as various glitches
in the Pylons sample template. The Pylons sample
template requires that you tell it where to
get the Engine from now. courtesy
Marcin Kuzminski
.. change::
:tags: bug
:tickets:
drop_index() ensures a dummy column
is added when it calls "Index", as SQLAlchemy
0.7.6 will warn on index with no column names.
.. changelog::
:version: 0.2.1
:released: Tue Jan 31 2012
.. change::
:tags: bug
:tickets: 26
Fixed the generation of CHECK constraint,
regression from 0.2.0
.. changelog::
:version: 0.2.0
:released: Mon Jan 30 2012
.. change::
:tags: feature
:tickets: 19
API rearrangement allows everything
Alembic does to be represented by contextual
objects, including EnvironmentContext,
MigrationContext, and Operations. Other
libraries and applications can now use
things like "alembic.op" without relying
upon global configuration variables.
The rearrangement was done such that
existing migrations should be OK,
as long as they use the pattern
of "from alembic import context" and
"from alembic import op", as these
are now contextual objects, not modules.
.. change::
:tags: feature
:tickets: 24
The naming of revision files can
now be customized to be some combination
of "rev id" and "slug", the latter of which
is based on the revision message.
By default, the pattern "<rev>_<slug>"
is used for new files. New script files
should include the "revision" variable
for this to work, which is part of
the newer script.py.mako scripts.
.. change::
:tags: bug
:tickets: 25
env.py templates call
connection.close() to better support
programmatic usage of commands; use
NullPool in conjunction with create_engine()
as well so that no connection resources
remain afterwards.
.. change::
:tags: bug
:tickets: 22
fix the config.main() function to honor
the arguments passed, remove no longer used
"scripts/alembic" as setuptools creates this
for us.
.. change::
:tags: bug
:tickets:
Fixed alteration of column type on
MSSQL to not include the keyword "TYPE".
.. change::
:tags: feature
:tickets: 23
Can create alembic.config.Config
with no filename, use set_main_option()
to add values. Also added set_section_option()
which will add sections.
.. changelog::
:version: 0.1.1
:released: Wed Jan 04 2012
.. change::
:tags: bug
:tickets:
Clean up file write operations so that
file handles are closed.
.. change::
:tags: feature
:tickets:
PyPy is supported.
.. change::
:tags: feature
:tickets:
Python 2.5 is supported, needs
__future__.with_statement
.. change::
:tags: bug
:tickets:
Fix autogenerate so that "pass" is
generated between the two comments
if no net migrations were present.
.. change::
:tags: bug
:tickets: 16
Fix autogenerate bug that prevented
correct reflection of a foreign-key
referenced table in the list of "to remove".
.. change::
:tags: bug
:tickets: 17
Fix bug where create_table() didn't
handle self-referential foreign key
correctly
.. change::
:tags: bug
:tickets: 18
Default prefix for autogenerate
directives is "op.", matching the
mako templates.
.. change::
:tags: feature
:tickets: 18
Add alembic_module_prefix argument
to configure() to complement
sqlalchemy_module_prefix.
.. change::
:tags: bug
:tickets: 14
fix quotes not being rendered in
ForeignKeConstraint during
autogenerate
.. changelog::
:version: 0.1.0
:released: Wed Nov 30 2011
.. change::
:tags:
:tickets:
Initial release. Status of features:
.. change::
:tags:
:tickets:
Alembic is used in at least one production
environment, but should still be considered
ALPHA LEVEL SOFTWARE as of this release,
particularly in that many features are expected
to be missing / unimplemented. Major API
changes are not anticipated but for the moment
nothing should be assumed.
The author asks that you *please* report all
issues, missing features, workarounds etc.
to the bugtracker, at
https://bitbucket.org/zzzeek/alembic/issues/new .
.. change::
:tags:
:tickets:
Python 3 is supported and has been tested.
.. change::
:tags:
:tickets:
The "Pylons" and "MultiDB" environment templates
have not been directly tested - these should be
considered to be samples to be modified as
needed. Multiple database support itself
is well tested, however.
.. change::
:tags:
:tickets:
Postgresql and MS SQL Server environments
have been tested for several weeks in a production
environment. In particular, some involved workarounds
were implemented to allow fully-automated dropping
of default- or constraint-holding columns with
SQL Server.
.. change::
:tags:
:tickets:
MySQL support has also been implemented to a
basic degree, including MySQL's awkward style
of modifying columns being accommodated.
.. change::
:tags:
:tickets:
Other database environments not included among
those three have *not* been tested, *at all*. This
includes Firebird, Oracle, Sybase. Adding
support for these backends should be
straightforward. Please report all missing/
incorrect behaviors to the bugtracker! Patches
are welcome here but are optional - please just
indicate the exact format expected by the target
database.
.. change::
:tags:
:tickets:
SQLite, as a backend, has almost no support for
schema alterations to existing databases. The author
would strongly recommend that SQLite not be used in
a migration context - just dump your SQLite database
into an intermediary format, then dump it back
into a new schema. For dev environments, the
dev installer should be building the whole DB from
scratch. Or just use Postgresql, which is a much
better database for non-trivial schemas.
Requests for full ALTER support on SQLite should be
reported to SQLite's bug tracker at
http://www.sqlite.org/src/wiki?name=Bug+Reports,
as Alembic will not be implementing the
"rename the table to a temptable then copy the
data into a new table" workaround.
Note that Alembic will at some point offer an
extensible API so that you can implement commands
like this yourself.
.. change::
:tags:
:tickets:
Well-tested directives include add/drop table, add/drop
column, including support for SQLAlchemy "schema"
types which generate additional CHECK
constraints, i.e. Boolean, Enum. Other directives not
included here have *not* been strongly tested
in production, i.e. rename table, etc.
.. change::
:tags:
:tickets:
Both "online" and "offline" migrations, the latter
being generated SQL scripts to hand off to a DBA,
have been strongly production tested against
Postgresql and SQL Server.
.. change::
:tags:
:tickets:
Modify column type, default status, nullable, is
functional and tested across PG, MSSQL, MySQL,
but not yet widely tested in production usage.
.. change::
:tags:
:tickets:
Many migrations are still outright missing, i.e.
create/add sequences, etc. As a workaround,
execute() can be used for those which are missing,
though posting of tickets for new features/missing
behaviors is strongly encouraged.
.. change::
:tags:
:tickets:
Autogenerate feature is implemented and has been
tested, though only a little bit in a production setting.
In particular, detection of type and server
default changes are optional and are off by default;
they can also be customized by a callable.
Both features work but can have surprises particularly
the disparity between BIT/TINYINT and boolean,
which hasn't yet been worked around, as well as
format changes performed by the database on defaults
when it reports back. When enabled, the PG dialect
will execute the two defaults to be compared to
see if they are equivalent. Other backends may
need to do the same thing.
The autogenerate feature only generates
"candidate" commands which must be hand-tailored
in any case, so is still a useful feature and
is safe to use. Please report missing/broken features
of autogenerate! This will be a great feature and
will also improve SQLAlchemy's reflection services.
.. change::
:tags:
:tickets:
Support for non-ASCII table, column and constraint
names is mostly nonexistent. This is also a
straightforward feature add as SQLAlchemy itself
supports unicode identifiers; Alembic itself will
likely need fixes to logging, column identification
by key, etc. for full support here.
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