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I have a model called SimplePage in which I have this line:
category = models.ForeignKey('Category', related_name='items',
blank=True, null=True)
I assumed this will allow me to have SimplePage instances that do not have a Category.
But for some reason, when I try to create a SimplePage in the Admin with no Category, I get:
IntegrityError at /admin/sitehelpers/simplepage/add/
sitehelpers_simplepage.category_id may not be NULL
What is this?
Could it possibly be that you added the
null=Trueattribute after doing thesyncdbfor that model? Django won’t change database tables, only create them. Check in your database ifNULLis allowed for that column and change it manually.Edit: starting with Django 1.7, this answer and the comments are not really valid anymore, since Django gained a fully featured migration framework.