PRIMARY KEY must be unique error (Django)

Question

->'views.py':

def upload_event_image(request):
  if request.method=="POST":
    if request.FILES:
      fest=get_object_or_404(Fest, pk=request.POST.get('fest_pk'))
      if fest is not None:
        event = Event.objects.create(
          author = request.user,
          fest = fest,
        )
        event.save()
        if event:
          photo= Photo.objects.create(
            image = request.FILES['file'],
            album = event //This line causes the error
          )
          photo.save()
        return HttpResponse()
  return HttpResponse()

-> model.py:

class Event(models.Model):
    title = models.CharField(max_length=60, blank=True)
    description = models.TextField(blank = True)
    fest = models.ForeignKey(Fest)
    pub_date = models.DateTimeField(default=datetime.datetime.now)
    author = models.ForeignKey(User)

    def __unicode__(self):
        return self.description

    def has_upvoted(self, user):
        return user

class Photo(models.Model):
    title = models.CharField(max_length=60 , blank= True, null = True)
    image = models.ImageField(upload_to='site-media/media/images/')
    thumbnail = models.ImageField(upload_to="site-media/media/images/thumbs/", blank=True, null=True)
    thumbnail2 = models.ImageField(upload_to="site-media/media/images/thumbs2/", blank=True, null=True)
    pub_date = models.DateTimeField(auto_now_add=True)
    album = models.ForeignKey(Event)

When i make a post to the above view i get 'PRIMARY KEY must be unique'. What am i doing wrong? This is the line "album = event" which causes the error.

Final solution after correction:

def save(self, force_insert=False, force_update=False, **kwargs):
    """Save image dimensions."""
    super(Photo, self).save(force_insert, force_update, **kwargs)
    im = PImage.open(pjoin(MEDIA_ROOT, self.image.name))
    self.width, self.height = im.size

    self.create_thumbnail()
    force_insert = False
    force_update = True

    super(Photo, self).save(force_insert, force_update, **kwargs)

Answer 1

From chat with Monique: the problem is in the (non-posted) Photo.save() method that makes two calls to super().save(), passing the same args in both cases, so the first call correctly creates the Photo instance and the second tries to insert it again, which obviously fails.

Solution (for anyone having the same problem): dont blindly pass *args and **kwargs to Model.save() when your overload it and end up calling it a second time.

class Foo(models.Model):
    def save(self, force_insert=False, force_update=False, **kwargs):
        super(Foo, self).save(force_insert, force_update, **kargs)
        if somethings_needs_to_be_done:
            do_something_here()
            super(Foo, self).save(force_insert=False, force_update=True, **kwargs)