Why can invalid models be saved?

Hi,

sorry for the newbie question!

In the admin I cannot create a user without a username, but on the shell it is possible:

>>> from django.contrib.auth.models import User

>>> u = User()

>>> u.save()

>>> u.id

2

I am trying to understand why this is possible. Does this mean model constraints in general are not enforced when instances are created and saved? Thus I will always have to validate my models before saving them, unless I set null=True on a field, in which case I'd expect to get an exception?

Thanks,

Claus

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