LIL-354. Add course ordering by id

api/v1/views.py

@@ -125,7 +125,7 @@ class CourseViewSet(ExtendedModelViewSet):
     }
     filter_fields = ('category', 'status', 'is_infinite', 'is_featured',)
     search_fields = ('author__email', 'title', 'category__title',)
-    ordering_fields = ('title', 'created_at', 'update_at',)
+    ordering_fields = ('id', 'title', 'created_at', 'update_at',)
     # permission_classes = (IsAuthorObjectOrAdmin,)
     # permission_map = {
     #     'create': IsAuthorOrAdmin,