Mixer for my flask app gives error when used with db.init_app() -- AttributeError: 'module' object has no attribute 'extensions' about mixer HOT 5 OPEN

Just a head's up I had a similar issue. The first error:

AttributeError: 'module' object has no attribute 'extensions'
In my case was because I was testing with out setting the application context.

with app.app_context():
    country = mixer.blend(Country)

The second issue:

AttributeError: Mixer (<class 'models.Country'>): 'NoneType' object has no attribute 'bases'.
Is most likely because the Country model contains a field not in the standard Sqlalchemy GenFactory. In my case (missing postgresql dialects UUID and ARRAY) this was resolved by creating a new factory for the missing fields.

def get_extents_array():
    """
    Generate a random extents array
    """
    return [0,1,0,1]

class SeerFactory(GenFactory):
    generators = {
        UUID: uuid4().__str__,
        (db.ARRAY, ARRAY): get_extents_array
    }
mixer = Mixer(commit=True, factory=SeerFactory)

This could be potentially made more clear in the GenFactory(mixer/ factory.py) classmethod get_fabric. If the field type doesn't exist fcls will equal None and therefore will not have a bases attribute. I'm not knowledgable enough about the code base to suggest a fix for it. But it should probably be a little more verbose about what field it doesn't have in the factory. I guess it's maybe worthwhile having and assert fcls is not None.

Offending piece of code at line 172 of factory.py.

# this will not work if fcls is None
if not func and fcls.__bases__:
    func = cls.generators.get(fcls.__bases__[0])

I hope that helps.

from mixer.

I also tried the Mixer class from mixer.backend.flask

from mixer.backend.flask import Mixer
mixer = Mixer(app, commit=True) 

It gives me a new error

AttributeError: Mixer (<class 'models.Country'>): 'NoneType' object has no attribute '__bases__'

from mixer.

Hi hussaintamboli
Did you resolve the issue?

from mixer.

I ended up using just Faker instead. I'll try to reproduce this issue when I get time.

from mixer.

I think this is similar issue to the fix in pull request #80

from mixer.