Unable to migrate models.

[RatanShreshtha]

I am getting AttributeError: module 'django_prometheus.models' has no attribute 'Mixin' when I try to run python manage.py migrate command, I have followed steps in the README.md file.

I am trying to use Prometheus with django 1.8 Python 3.5.3 Fedora 25.

[elnappo]

Same error here: Django 2.0.2 django-prometheus 1.0.11 Python 3.6.4

Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
    utility.execute()
  File "/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 347, in execute
    django.setup()
  File "/venv/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/venv/lib/python3.6/site-packages/django/apps/registry.py", line 120, in populate
    app_config.ready()
  File "/venv/lib/python3.6/site-packages/django_prometheus/apps.py", line 24, in ready
    ExportMigrations()
  File "/venv/lib/python3.6/site-packages/django_prometheus/migrations.py", line 46, in ExportMigrations
    executor = MigrationExecutor(connections[alias])
  File "/venv/lib/python3.6/site-packages/django/db/migrations/executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/venv/lib/python3.6/site-packages/django/db/migrations/loader.py", line 49, in __init__
    self.build_graph()
  File "/venv/lib/python3.6/site-packages/django/db/migrations/loader.py", line 200, in build_graph
    self.load_disk()
  File "/venv/lib/python3.6/site-packages/django/db/migrations/loader.py", line 109, in load_disk
    migration_module = import_module("%s.%s" % (module_name, migration_name))
  File "/usr/local/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/code/api/migrations/0001_initial.py", line 10, in <module>
    class Migration(migrations.Migration):
  File "/code/api/migrations/0001_initial.py", line 42, in Migration
    bases=(django_prometheus.models.Mixin, models.Model),
AttributeError: module 'django_prometheus.models' has no attribute 'Mixin'

[5igm4]

Has there been any progress made on this issue? I'm currently running into it myself. Django 2.0 django-prometheus==1.0.13 Python 3.6.5

[voigt]

Was able to fix the issue by removing the line import django_prometheus.models and bases=(django_prometheus.models.Mixin, models.Model), from all migrations.CreateModel. Afterwards I was able to successfully run the migrations.

...
import django_prometheus.models    <- remove

        migrations.CreateModel(
            name='<name>',
            fields=[
             ...
            ],
            options={
                'ordering': ['...'],
            },
            bases=(django_prometheus.models.Mixin, models.Model),   <- remove
        ),

I have no idea whats happening here. Maybe this helps someone. The disadvantage is, that if you recreate your migrations you have to do the procedure again...

I am running on

• Django 1.11
• django-prometheus 1.0.15
• Python 3.6.6

[weijiangan]

Was able to fix the issue by removing the line import django_prometheus.models and bases=(django_prometheus.models.Mixin, models.Model), from all migrations.CreateModel. Afterwards I was able to successfully run the migrations.

...
import django_prometheus.models    <- remove

        migrations.CreateModel(
            name='<name>',
            fields=[
             ...
            ],
            options={
                'ordering': ['...'],
            },
            bases=(django_prometheus.models.Mixin, models.Model),   <- remove
        ),

I have no idea whats happening here. Maybe this helps someone. The disadvantage is, that if you recreate your migrations you have to do the procedure again...

I am running on

• Django 1.11
• django-prometheus 1.0.15
• Python 3.6.6

I'm doing exactly the same thing right now it's annoying

[knicholes]

Just hit the same issue. Fixed as shown above.

[acherry]

Also hit same issue, fixed as above. I did try changing django_prometheus.models.Mixin to django_prometheus.models.ExportModelOperationsMixin just in case it was just a naming issue, but that didn't help. This is in a class that inherits from another Django base model; perhaps that's causing issues? This was the first migration after adding the class. I'm using:

• Django 2.1.7
• Python 3.6.7
• django-prometheus 1.0.15
• prometheus-client 0.6.0
• django-simple-history 2.7.0 (only mentioned because it has caused a couple of other migration issues for me)

[mmdaz]

I changed the bases=(models.Model, django_prometheus.models.Mixin) line with bases=(models.Model, django_prometheus.models.ExportModelOperationsMixin('model_name')) and it worked.

I think there is a bug in the library when it wants to create the migration file.

[chrislat]

Just wondering whether there is an update on this? Perhaps a more elegant fix?