Question

I have this model:

class Auth(models.Model):
    TYPES = (
         ('agent', 'Agent'),
         ('broker', 'Broker'),
     )
    user = models.ForeignKey(User, unique=True)
    type = models.CharField(max_length=20, choices=TYPES)
    applied = models.BooleanField()
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField(db_index=True)
    content_object=generic.GenericForeignKey('content_type', 'object_id')

and whenever I do something like this:

User.objects.create_user(username="myuser", password="myuser", email="myemail.com")
u = User.objects.get(username="myuser")
profile = Auth(user=u)
profile.save()

of course I will receive the error:

IntegrityError: (1048, "Column 'content_type_id' cannot be null")

For my purposes, I can’t avoid contenttypes because Auth is a class where a Broker and Agent class inherits from, which allows me to do multiple custom profiles.

I was wondering if there was a way in which the content type would not be required.

Thanks in advance!

Answer 1

content_type = models.ForeignKey(ContentType, null=True, blank=True)

null=True makes it optional in the data model, blank=True makes it optional when using admin form (otherwise you’ll get validation error).