python - django integrity error, many to many relationship -

that's models.py:

class user(models.model): email = models.emailfield() def __unicode__(self): return str(self.email) class link(models.model): link = models.urlfield() users = models.manytomanyfield(user, through='shorturl') class shorturl(models.model): link = models.foreignkey(link) user = models.foreignkey(user) short_end = models.charfield(max_length=20) counter = models.integerfield() 

adding users works fine:

>>> user = user.objects.create("john_doe@planetearth.com") 

i integrity error when try add link:

>>> link = link.objects.create("stackoverflow.com") integrityerror: shortener_link.short_end may not null 

what missing?

you need create link this:

link.objects.create(link="stackoverflow.com", user = request.user, short_end = 'stack', counter = 0) 

since of fields required.