#24563: Migration for M2M Field fails with FieldDoesNotExist when removing
null=True from model
-------------------------------------+-------------------------------------
Reporter: GitRon | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.8
Severity: Normal | Resolution:
Keywords: migrations, | Triage Stage:
many2many, nullable | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by codefisher):
* status: closed => new
* resolution: needsinfo =>
Comment:
I had exactly the same problem. The following is a stack trace for the
error.
{{{
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/__init__.py", line 338, in
execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/__init__.py", line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/base.py", line 390, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/base.py", line 441, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-
packages/django/core/management/commands/migrate.py", line 221, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python2.7/dist-
packages/django/db/migrations/executor.py", line 110, in migrate
self.apply_migration(states[migration], migration, fake=fake,
fake_initial=fake_initial)
File "/usr/local/lib/python2.7/dist-
packages/django/db/migrations/executor.py", line 147, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python2.7/dist-
packages/django/db/migrations/migration.py", line 115, in apply
operation.database_forwards(self.app_label, schema_editor, old_state,
project_state)
File "/usr/local/lib/python2.7/dist-
packages/django/db/migrations/operations/fields.py", line 201, in
database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/usr/local/lib/python2.7/dist-
packages/django/db/backends/base/schema.py", line 469, in alter_field
return self._alter_many_to_many(model, old_field, new_field, strict)
File "/usr/local/lib/python2.7/dist-
packages/django/db/backends/sqlite3/schema.py", line 232, in
_alter_many_to_many
override_uniques=(new_field.m2m_field_name(),
new_field.m2m_reverse_field_name()),
File "/usr/local/lib/python2.7/dist-
packages/django/db/backends/sqlite3/schema.py", line 137, in _remake_table
self.create_model(temp_model)
File "/usr/local/lib/python2.7/dist-
packages/django/db/backends/base/schema.py", line 268, in create_model
columns = [model._meta.get_field(field).column for field in fields]
File "/usr/local/lib/python2.7/dist-
packages/django/db/models/options.py", line 554, in get_field
raise FieldDoesNotExist('%s has no field named %r' %
(self.object_name, field_name))
django.core.exceptions.FieldDoesNotExist: Forum_subscriptions has no field
named None
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/24563#comment:3>
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