I have a task to modify queryset after that a received its from DB and before context. I do the next: products = list(qs) #create a copy of qs to avoid modifying in DB for product in products: access_table = FieldAccess.objects.filter(user=user, product=product.pk).values_list('access', flat=True) fields = [Choices.objects.filter(pk=item).values_list('field_name', flat=True) for item in access_table if not access_table[0] == None] for field in fields: setattr(product, field[0], None) #assign a new value to particular field of object return products It works fine except of ManyToMany Fields. If I try to set None value I get an error: 'NoneType' object is not iterable What do I have to assign? Prehistory I need to limit value visibility of particular field items in the model for particular users. I created intermediate model that contain references on user, object of model and which fields should be hidden. I really don't no how to implement that via queryset, but my snippet with modifying on the fly works well Continue reading...
