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.
fixes #310
and :meth:`.BatchOperations.create_check_constraint`.
fixes #305
- table keyword arguments are copied from the original reflected table,
such as the "mysql_engine" keyword argument.
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.
fixes #300
"ondelete" would not render within the ``op.create_foreign_key()``
directive, even though they render within a full
``ForeignKeyConstraint`` directive.
fixes #298
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.
fixes #297
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.
fixes #296
: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.
fixes #255
- enhance the op_fixture as well as MigrationContext._stdout_connection()
so that it uses the real DefaultImpl
and MigrationContext fully in tests.
: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``.
fixes #289
- sqlite dialect checks for "create_index" and "drop_index" as exceptions
for "recreate" in batch mode, the same way as "add_column", so that
unnecessary table recreates don't emit for index-only operations
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.
fixes #282
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.
fixes #276
get_current_heads() directly; therefore we don't need to
do this in alembic.command, which we were doing for stamp but
not downgrade/upgrade. The slight change here is that the
context.get_starting_revision_argument() method will
return an abbreviated starting rev as abbreviated in
all cases, including the stamp command, where we previously
were converting a stamp argument first, but not for the
upgrade or downgrade commands.
- Fixed bug where using a partial revision identifier as the
"starting revision" in ``--sql`` mode in a downgrade operation
would fail to resolve properly. fixes #269
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.
Mike Bayer