Roberto Roberto - 15 days ago 6
Python Question

Django migrations error KeyError: ('list', u'user')

I am trying to run

python manage.py migrate


or

python manage.py makemigrations


I got this error:

Running migrations:
No migrations to apply.
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
utility.execute()
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/core/management/base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/core/management/base.py", line 399, in execute
output = self.handle(*args, **options)
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 183, in handle
executor.loader.project_state(),
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/db/migrations/loader.py", line 338, in project_state
return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self.unmigrated_apps))
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/db/migrations/graph.py", line 280, in make_state
project_state = self.nodes[node].mutate_state(project_state, preserve=False)
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/db/migrations/migration.py", line 88, in mutate_state
operation.state_forwards(self.app_label, new_state)
File "/Users/rostunov/temp/venv/lib/python2.7/site-packages/django/db/migrations/operations/models.py", line 547, in state_forwards
model_state = state.models[app_label, self.name_lower]
KeyError: ('list', u'user')


It happen after I pulled another version of my app from the git.

I don't have this error with the same code on the another machine.
I've tried to use
--fake
with
zero
or to
squashmigrations
to previous but this also doesn't help.

Cannot get how to solve it.

Answer

The problem was in migration files. While I was making commit into git somehow I've deleted one of the migration files, so the order was like 0001 0003 0004 without 0002. In the second migration file I've created a model named user.

The problem was that when I run python manage.py migrate django could not find the place where the model named user has been created (this model has been created in 0002 file).

I solved it by manually adding this code to the 0001 migration file:

migrations.CreateModel(
        name='user',
        fields=[
            (...necessary fields...),
        ],
        options={
            'ordering': ('title',),
        },
    ),