SQLite's schema editor doesn't handle index_together

[Markus Holtermann]

The SQLite schema editor doesn't handle index_together changes. This manifests itself when renaming a field that is part of index_together.

I came across the bug when fixing https://code.djangoproject.com/ticket/23859#comment:6 . After RenameField's database_forwards() has run the index is missing.

Traceback (most recent call last):
  File "/home/jenkins/workspace/django-pull-requests/database/sqlite3/python/python3.4/tests/migrations/test_operations.py", line 1016, in test_rename_field
    self.assertIndexExists("test_rnfl_pony", ["weight", "blue"])
  File "/home/jenkins/workspace/django-pull-requests/database/sqlite3/python/python3.4/tests/migrations/test_base.py", line 46, in assertIndexExists
    for c in connection.introspection.get_constraints(cursor, table).values()
AssertionError: True != False

[Markus Holtermann]

Here's a pull request: ​https://github.com/django/django/pull/3653

[Loic Bistuer]

LGTM

[Loic Bistuer <loic.bistuer@…>]

In d2202ec2d4d0477b682c6d0051f27ab4843ef89f:

Fixed #23880 -- Added missing index_together handling for SQLite

[Tim Graham <timograham@…>]

In ba3e97618696bdd68e4ac9b2220f58e6b3d15bd4:

[1.7.x] Fixed #23880 -- Added missing index_together handling for SQLite

Backport of d2202ec2d4d0477b682c6d0051f27ab4843ef89f from master