id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
23065	Migration Error when removing unique constraint	anonymous	nobody	"I try to make a migration which simple removes ""unique = True"" from a field. and get the error below.

Note this is nothing to do with Django's standard auth module, but a custom implementation, as far as I can see that should have nothing to do with it.

This is a private project so I can't give many more details than this. I'm using Postgres and the current 1.7 rc.

{{{
python manage.py makemigrations
Migrations for 'Auth':
  0003_auto_20140721_1413.py:
    - Alter field name on permission
(env)samuel || python manage.py migrate
Operations to perform:
  Synchronize unmigrated apps: bootstrapform, django_jinja, admin_tools, theming, dashboard
  Apply all migrations: Schedule, admin, sessions, auth, contenttypes, Accounts, Auth, CRM
Synchronizing apps without migrations:
  Creating tables...
  Installing custom SQL...
  Installing indexes...
Running migrations:
  Applying Auth.0003_auto_20140721_1413...Traceback (most recent call last):
  File ""manage.py"", line 10, in <module>
    execute_from_command_line(sys.argv)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 385, in execute_from_command_line
    utility.execute()
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/core/management/base.py"", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/core/management/base.py"", line 337, in execute
    output = self.handle(*args, **options)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py"", line 160, in handle
    executor.migrate(targets, plan, fake=options.get(""fake"", False))
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 62, in migrate
    self.apply_migration(migration, fake=fake)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 96, in apply_migration
    migration.apply(project_state, schema_editor)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/migrations/migration.py"", line 107, in apply
    operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/migrations/operations/fields.py"", line 131, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/backends/schema.py"", line 506, in alter_field
    self._alter_field(model, old_field, new_field, old_type, new_type, old_db_params, new_db_params, strict)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/backends/schema.py"", line 525, in _alter_field
    ""name"": constraint_name,
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/backends/schema.py"", line 98, in execute
    cursor.execute(sql, params)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/backends/utils.py"", line 81, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/backends/utils.py"", line 65, in execute
    return self.cursor.execute(sql, params)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/utils.py"", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File ""/path/to/project/env/local/lib/python2.7/site-packages/django/db/backends/utils.py"", line 65, in execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: constraint ""auth_permission_name_key"" of relation ""Auth_permission"" does not exist

}}}"	Bug	closed	Migrations	1.7	Release blocker	fixed	migrations		Accepted	1	0	0	0	0	0