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i am working on saving on the same form two tables - having a m2m relation. I don't succeed, my error persists with something like: Cannot set values on a ManyToManyField which specifies an intermediary model. Use Membership's Manager instead where Membership is my 'through table'. my code : def save_classroom(request): classroom_instance = Classroom() if request.method == 'POST': form = ClassroomForm(request.POST, request.FILES, user = request.user) if form.is_valid(): new_obj = form.save(commit=False) new_obj.user = request.user new_obj.save() membership = Membership(member = request.user,classroom=new_obj) membership.save() form.save_m2m() return HttpResponseRedirect('.') else: form = ClassroomForm(user = request.user) return render_to_response('classroom/classroom_form.html', { 'form': form, }, context_instance=RequestContext(request)) my models: class Classroom(models.Model): user = models.ForeignKey(User, related_name = 'classroom_creator') classname = models.CharField(max_length=140, unique = True) date = models.DateTimeField(auto_now=True) open_class = models.BooleanField(default=True) members = models.ManyToManyField(User,related_name="list of invited members", through = 'Membership') class Membership(models.Model): accept = models.BooleanField(default=False) date = models.DateTimeField(auto_now = True) classroom = models.ForeignKey(Classroom, related_name = 'classroom_membership') member = models.ForeignKey(User, related_name = 'user_membership') where am i wrong?

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