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Version 0.8 of SQLAlchemy added support of indexes on expressions in addition to plain table columns, which changed the way indexes are created. This broke support of dropping columns of composite indexes for SQLite: due to limitations of ALTER in SQLite every time a column is dropped, we recreate the whole table without the given column; if a column is a part of a composite index, we change the index definition to omit that column and then indexes are recreated too. SQLAlchemy versions starting from 0.8 no more pay attention to 'columns' attribute of Index instances when generating DDL for indexes, so when one of columns of a composite index is dropped, we try to create a new index on the column that doesn't exist anymore, which of course fails. Closes-Bug: #1241038 Change-Id: I777b8ce36e36f49bfb0889908811a063cf1a527b
sqlalchemy-migrate
Fork from http://code.google.com/p/sqlalchemy-migrate/ to get it working with SQLAlchemy 0.8.
Inspired by Ruby on Rails' migrations, Migrate provides a way to deal with database schema changes in SQLAlchemy projects.
Migrate extends SQLAlchemy to have database changeset handling. It provides a database change repository mechanism which can be used from the command line as well as from inside python code.
Help
Sphinx documentation is available at the project page packages.python.org.
Users and developers can be found at #sqlalchemy-migrate on Freenode IRC network and at the public users mailing list migrate-users.
New releases and major changes are announced at the public announce mailing list migrate-announce and at the Python package index sqlalchemy-migrate.
Homepage is located at stackforge
You can also clone a current development version
Tests and Bugs
To run automated tests:
- Copy test_db.cfg.tmpl to test_db.cfg
- Edit test_db.cfg with database connection strings suitable for running tests. (Use empty databases.)
- $ pip install -r requirements.txt -r test-requirements.txt
- $ python setup.py develop
- $ testr run --parallel
Please report any issues with sqlalchemy-migrate to the issue tracker at code.google.com issues