django 1.10.3 Cannot resolve bases after flush

Question

I have a playground for model developement.

When running python manage.py makemigrations the Error

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/core/management/__init__.py", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/core/management/base.py", line 294, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/core/management/base.py", line 345, in execute
    output = self.handle(*args, **options)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 173, in handle
    migration_name=self.migration_name,
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 47, in changes
    changes = self._detect_changes(convert_apps, graph)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 132, in _detect_changes
    self.old_apps = self.from_state.concrete_apps
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/db/migrations/state.py", line 180, in concrete_apps
    self.apps = StateApps(self.real_apps, self.models, ignore_swappable=True)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/db/migrations/state.py", line 242, in __init__
    self.render_multiple(list(models.values()) + self.real_models)
  File "/home/IPP-HGW/dboe/anaconda2/lib/python2.7/site-packages/django/db/migrations/state.py", line 285, in render_multiple
    "for more" % (new_unrendered_models, get_docs_version())
django.db.migrations.exceptions.InvalidBasesError: Cannot resolve bases for [<ModelState: 'main.Component'>, <ModelState: 'main.MagneticConfig'>, <ModelState: 'main.NetStructure'>, <ModelState: 'main.Program'>, <ModelState: 'main.FilePath'>]
This can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)
 in an app with no migrations; see https://docs.djangoproject.com/en/1.10/topics/migrations/#dependencies for more

Keeps occuring though i tried a hell of a lot:

of course python manage.py makemigration <appName>
python manage.py migrate <appName>
drop all tables from the app
python manage.py squashmigrations main 0001
emptied the models.py file
uncommented the app in settings
read everything i could find on that
flushing the whole database python manage.py flush

Any idea, how to solve this? Thanks, Daniel

Edit Nov_29: Stack trace added

If you have an error, you should post the whole thing, including the traceback. — Daniel Roseman, Nov 28 '16 at 18:01

score 0 · Accepted Answer · edited May 23 '17 at 12:08

0

Finally i got the solution. I found out, that the migrations are stored in a file in the application folder. You can delete these by hand. Of course, you need to be very careful with this.

Take a look at this if you got the same problem.

edited May 23 '17 at 12:08

Community

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answered Nov 29 '16 at 15:13

Daniel Böckenhoff

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django 1.10.3 Cannot resolve bases after flush

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