Question

I have following model:

class Client(models.Model):
    user = models.OneToOneField(DjangoUser, unique=True)
    address = models.ForeignKey(Address,blank=True)

class Address(models.Model):
    (...)

Then I do:

client=Client()
client.address=address #any Address instance
client.save()

And now: how can I remove foreign association key from client?

client.address=None 

seem not to work.

Answer 1

To be able to null out a foreign key, it’s not enough to set in blank. You must also specify that null=True is also set on the field. See The Difference Between Blank and Null.