quoted class names in foreign key definition causes ValueError

[Renato Oliveira]

my scenario

Ramiro, I CCed you because of this comment: ticket:10405#comment:46

app_a/models.py

class Model_A(models.Model):
    name = models.CharField(...)

app_b/models.py

class Model_B(models.Model):
    field_a = models.ForeignKey('app_a.Model_A' ...)

app_b/forms.py

from app_b.models import Model_B


class FormModel_B(forms.ModelForm):
    
    class Meta:
        model = Model_B

On app_b/tests/test_forms.py I have

from app_b.forms import FormModel_B

And it gives me a ValueError

ValueError: Cannot create form field for 'field_a' yet, because its related model 'app_a.Model_A' has not been loaded yet

But when I just import Model_A on app_b/models.py file

from app_a.models import Model_A


class Model_B(models.Model):
    field_a = models.ForeignKey('app_a.Model_A' ...)

my settings.py

INSTALLED_APPS = (
    ...
    'app_a',
    'app_b',
}

It works.

This is actually code from the project that I created to reproduce the behavior.

​https://github.com/renatooliveira/test_bug

I'm willing to try fix this issue since it's accepted.

Best Regards.

[Renato Oliveira]

Same issue as here: https://code.djangoproject.com/ticket/22865

Sorry