1.8.0

Released: May 31, 2022

changed

• [changed] [installation] Alembic 1.8 now supports Python 3.7 and above.

  References: #1025

• [changed] [environment] The "Pylons" environment template has been removed as of Alembic 1.8. This template was based on the very old pre-Pyramid Pylons web framework which has been long superseded by Pyramid.

  References: #987

feature

• [feature] [typing] PEP 484 typing annotations have been added to the env.py and revision template files within migration templates. Pull request by Nikita Sobolev.

  References: #764

usecase

• [usecase] [operations] The op.drop_table() operation directive will now trigger the before_drop() and after_drop() DDL event hooks at the table level, which is similar to how the before_create() and after_create() hooks are triggered by the op.create_table() directive. Note that as op.drop_table() accepts only a table name and optional schema name, the Table object received by the event will not have any information within it other than the table name and schema name.

  References: #1037

• [usecase] [commands] Added new token epoch to the file_template option, which will populate the integer epoch as determined by int(create_date.timestamp()). Pull request courtesy Caio Carvalho.

  References: #1027

bug

• [bug] [revisioning] Fixed issue where a downgrade using a relative revision would fail in case of multiple branches with a single effectively head due to interdependencies between revisions.

  References: #1026

• [bug] [batch] Fixed issue in batch mode where CREATE INDEX would not use a new column name in the case of a column rename.

  References: #1034