contenttypes

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• contenttypes

Model

from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType

class MyModel(models.Model):
    content_type = models.ForeignKey(ContentType, null=True)
    object_id = models.PositiveIntegerField(null=True)
    content_object = GenericForeignKey()

>>> from django.contrib.auth.models import User
>>> user_row = User.objects.get(username='Guido')
>>> my_row = MyModel()
>>> my_row.content_object=user_row
>>> my_row.save()
>>> my_row.content_object
<User: Guido>

QuerySet

from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType

user_row = User.objects.get(username='Guido')

my_row = MyModel.objects.get(
    content_type=ContentType.objects.get_for_model(user_row),
    object_id=user_row.pk
)

Unique

From How can I make and enforce a generic OneToOne relation in django:

class Meta:
    unique_together = ('object_id', 'content_type')