Fix test_non_model_serializer

Author: Maxime Toussaint

tests/test_conditions.py

@@ -119,6 +119,9 @@ class PizzaSerializer(PrefetchingSerializerMixin, serializers.Serializer):
             toppings = ToppingSerializer(many=True)
             label = serializers.CharField()
 
+            class Meta:
+                model = Pizza
+
         pizzas = Pizza.objects.all()
         serializer = PizzaSerializer(pizzas, many=True)