#30035: many to many through table not recognisable in custom migration
-------------------------------------+-------------------------------------
Reporter: jainmickey | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 2.0
Severity: Normal | Resolution:
Keywords: many to many, | Triage Stage:
through | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by jainmickey:
Old description:
> I have a model `A` having field `b` as many to many. I wanted to make `b`
> default through table's default id field to be UUID.
> If I do that using through table, the admin interface changes to Inline
> and I don't want that. So, I tried writing a custom migration to do that.
>
> If I am checking the default intermediate table using `apps.get_model` it
> exists but when I use the same table in migrations it gives me error:
>
> ```
> File "./manage.py", line 19, in <module>
> execute_from_command_line(sys.argv)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/core/management/__init__.py", line 371, in
> execute_from_command_line
> utility.execute()
> File "/Users/mj/.virtualenvs/
> proj/lib/python3.6/site-packages/django/core/management/__init__.py",
> line 365, in execute
> self.fetch_command(subcommand).run_from_argv(self.argv)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/core/management/base.py", line 288, in run_from_argv
> self.execute(*args, **cmd_options)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/core/management/base.py", line 335, in execute
> output = self.handle(*args, **options)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/core/management/commands/migrate.py", line 200, in handle
> fake_initial=fake_initial,
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/db/migrations/executor.py", line 117, in migrate
> state = self._migrate_all_forwards(state, plan, full_plan, fake=fake,
> fake_initial=fake_initial)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/db/migrations/executor.py", line 147, in
> _migrate_all_forwards
> state = self.apply_migration(state, migration, fake=fake,
> fake_initial=fake_initial)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/db/migrations/executor.py", line 244, in apply_migration
> state = migration.apply(state, schema_editor)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/db/migrations/migration.py", line 112, in apply
> operation.state_forwards(self.app_label, project_state)
> File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
> packages/django/db/migrations/operations/fields.py", line 70, in
> state_forwards
> state.models[app_label,
> self.model_name_lower].fields.append((self.name, field))
> KeyError: ('app', 'A_b')
> ```
New description:
I have a model `A` having field `b` as many to many. I wanted to make `b`
default through table's default id field to be UUID.
If I do that using through table, the admin interface changes to Inline
and I don't want that. So, I tried writing a custom migration to do that.
If I am checking the default intermediate table using `apps.get_model` it
exists but when I use the same table in migrations it gives me error:
{{{
File "./manage.py", line 19, in <module>
execute_from_command_line(sys.argv)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/core/management/__init__.py", line 371, in
execute_from_command_line
utility.execute()
File "/Users/mj/.virtualenvs/
proj/lib/python3.6/site-packages/django/core/management/__init__.py", line
365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/core/management/base.py", line 335, in execute
output = self.handle(*args, **options)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/core/management/commands/migrate.py", line 200, in handle
fake_initial=fake_initial,
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake,
fake_initial=fake_initial)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/db/migrations/executor.py", line 147, in
_migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake,
fake_initial=fake_initial)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/db/migrations/migration.py", line 112, in apply
operation.state_forwards(self.app_label, project_state)
File "/Users/mj/.virtualenvs/proj/lib/python3.6/site-
packages/django/db/migrations/operations/fields.py", line 70, in
state_forwards
state.models[app_label,
self.model_name_lower].fields.append((self.name, field))
KeyError: ('app', 'A_b')
}}}
--
--
Ticket URL: <https://code.djangoproject.com/ticket/30035#comment:1>
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