Question

I’ve been looking at this a few days now and am getting to pullout my hair so any help would be appreciated.

I have a simple model called package that has a userFrom and userTo

class Package(models.Model):

  title = models.CharField(max_length=50)
  packageid = models.CharField(primary_key=True, max_length=64, default=uuid_str, editable=False)
  userfrom  = models.ForeignKey('auth.user', editable=False, related_name='userfrom')
  userto  = models.ForeignKey('auth.user', editable=False, related_name='userto')

and my views for package has the following to assign the mapping

 def pre_save(self, obj):
    print "adding user to object! %s "%self.request.user
    obj.userfrom = self.request.user

Hoever it seems that pre_save isn’t getting called and the mapping of userid’s isn’t happening. When I log in with the api and try to push a new package I get the error.

I’ve tried to map this has closely as possible to the tutorial http://django-rest-framework.org/tutorial/4-authentication-and-permissions.html without any luck.

Exception Type: IntegrityError
Exception Value:
null value in column “userfrom_id” violates not-null constraint

browsing the source to the sql I can see that userfrom_id and userto_id are both null.

Any idea’s much appreciated.

J

Answer 1

I had the same issue…

You have to call the pre_save in your post with the serialized object:

def post(self, request, format=None):
    serializer = SnippetSerializer(data=request.DATA)
    if serializer.is_valid():
        self.pre_save(serializer.object) #pass in serializer.object
        serializer.save()