Hi everyone,
This is my first post in this group so do not hesitate to ask for some more
specific details if this is not enough. Django version is 2.2.9, Python 3.6.
I'm facing an error when trying to migrate back the initial migration of a
freshly installed new application 'billing'.
The error message is the following one :
> *ValueError: The field form.Form.ticket_description was declared with a
> lazy reference to 'tickets.ticketdescription', but app 'tickets' doesn't
> provide model 'ticketdescription'.*
*However the model 'ticketdescription' has been dropped several month ago
and is no longer present in my project*. Thus the part " app 'tickets'
doesn't provide model 'ticketdescription' " is perfectly right, but I don't
get why it is not managed by the migration of app 'tickets' which dropped
the model 'ticketdescription'.
The model 'ticketdescription' remains as a pending model of state apps in
the migration executor, I would expect it to be removed.
Until now, I could migrate backward other apps without any issue but after
adding the app 'billing', which is not directly related to app 'tickets',
it is not possible anymore.
I don't know where to look at to fix this issue ? Could you help me
debugging please ? This looks like a bug but I'm not sure !
Best regards,
Adrien
Here is the full error trace :
Traceback (most recent call last):
> File "manage.py", line 23, in <module>
> execute_from_command_line(sys.argv)
> File
> "[...]/lib/python3.6/site-packages/django/core/management/__init__.py",
> line 381, in execute_from_command_line
> utility.execute()
> File
> "[...]/lib/python3.6/site-packages/django/core/management/__init__.py",
> line 375, in execute
> self.fetch_command(subcommand).run_from_argv(self.argv)
> File "[...]/lib/python3.6/site-packages/django/core/management/base.py",
> line 323, in run_from_argv
> self.execute(*args, **cmd_options)
> File "[...]/lib/python3.6/site-packages/django/core/management/base.py",
> line 364, in execute
> output = self.handle(*args, **options)
> File "[...]/lib/python3.6/site-packages/django/core/management/base.py",
> line 83, in wrapped
> res = handle_func(*args, **kwargs)
> File
> "[...]/lib/python3.6/site-packages/django/core/management/commands/migrate.py",
>
> line 234, in handle
> fake_initial=fake_initial,
> File
> "[...]/lib/python3.6/site-packages/django/db/migrations/executor.py", line
> 121, in migrate
> state = self._migrate_all_backwards(plan, full_plan, fake=fake)
> File
> "[...]/lib/python3.6/site-packages/django/db/migrations/executor.py", line
> 173, in _migrate_all_backwards
> for migration, _ in full_plan:
> File "[...]/lib/python3.6/site-packages/django/utils/functional.py",
> line 80, in __get__
> res = instance.__dict__[self.name] = self.func(instance)
> File "[...]/lib/python3.6/site-packages/django/db/migrations/state.py",
> line 210, in apps
> return StateApps(self.real_apps, self.models)
> File "[...]/lib/python3.6/site-packages/django/db/migrations/state.py",
> line 280, in __init__
> raise ValueError("\n".join(error.msg for error in errors))
> ValueError: The field form.Form.ticket_description was declared with a
> lazy reference to 'tickets.ticketdescription', but app 'tickets' doesn't
> provide model 'ticketdescription'.
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