Question

I have have a many-to-many relation in a Django(1.4) model.

class UserProfile(models.Model):
    foos = models.ManyToManyField(Foo)

I want to enforce that each User(Profile) has at least one Foo. Foos can have zero-or-more User(Profiles)s.

I would love this to be enforced at the model and admin levels, but just enforcing it in the admin would be sufficient.

If I understand correctly, ‘many’ in Django-speak is zero-or-more.

I want a ManyToOneOrMore relation. How can I do this?

Thanks,

Chris.

Answer 1

You can’t enforce this on at the model level as @Greg details, but you can enforce it on a form by simply making the field required. This won’t prevent anyone with shell-level access from manually creating a UserProfile without a foo, but it will force anyone using a browser-based form method of creation.