'BatchOperations' object has no attribute 'rename_table'

[Stephen Finucane]

Describe the bug

After an upgrade to 1.11.x, I now see the following error messages in a migration:

AttributeError: 'BatchOperations' object has no attribute 'rename_table'

The migration in question is doing this:

def upgrade_export_locations_table(connection):
    ...

    with op.batch_alter_table("share_export_locations") as batch_op:
        batch_op.drop_constraint('sel_id_fk', type_='foreignkey')
        batch_op.drop_column('share_id')
        batch_op.rename_table('share_export_locations',
                              'share_instance_export_locations')

Things worked (or at least, didn't fail) on 1.10.4 and before. Now, the ops docs suggest this was never supported, but it worked and therefore we used it.

The fix is rather easy: we can just change the above to:

def upgrade_export_locations_table(connection):
    ...

    with op.batch_alter_table("share_export_locations") as batch_op:
        batch_op.drop_constraint('sel_id_fk', type_='foreignkey')
        batch_op.drop_column('share_id')
    op.rename_table('share_export_locations',
                    'share_instance_export_locations')

...but there's no mention of this change in behavior in the release notes for 1.11. It would be good to add it, even if retrospectively, if this was indeed intentional.

Expected behavior

I'd expect one of the two things to happen:

• BatchOperations.rename_table is defined as an alias of Operations.rename_table and does the exact same thing
• There is a note in the release notes for 1.11.0 indicating that this behaviour changed.

(PS: I did try looking at the rel_1_10_4...rel_1_11_0 diff and commit 2aba0ad looks like the most likely candidate for this issue, but I have yet to go much deeper than this)

To Reproduce

See https://github.com/stephenfin/alembic-issue-1453 for a minimal'ish reproducer.

Error

AttributeError: 'BatchOperations' object has no attribute 'rename_table'

Versions.

• OS: Fedora
• Python: 3.12
• Alembic: 1.11.0
• SQLAlchemy: 1.4.51
• Database: MySQL
• DBAPI: mysql

Additional context

Have a nice day!

[Federico Caselli]

Hi,

This was caused by the change done as part of #1093 and mentioned in this change note: https://alembic.sqlalchemy.org/en/latest/changelog.html#change-3bdff00f5f667e502dd8506162574a24

I agree that we could note a bit better that the rename_table was removed as a consequence of the change of the class hierarchy in between operation and batch operation.

So I would consider this only a documentation change. @zzzeek do you agree here?

Can you provide a PR with the updated changelog?

[Michael Bayer]

doc change is fine sure