`add_term` in api views should return json of the serialized version of the...

`add_term` in api views should return json of the serialized version of the new item -- currently empty dict

https://trello.com/c/fWrvZDau/77-clear-out-technical-debt-from-working-on-taxonomies

django/website/rest_api/tests/categorize_items_tests.py

@@ -70,6 +70,15 @@ def test_item_can_haz_category(term, item):
 
 # TODO test for terms with the same name in different taxonomies
 
+@pytest.mark.django_db
+def test_categorize_item_returns_the_categorized_item(term, item):
+    result = categorize_item(item, term).data
+
+    assert result['id'] == item['id']
+    terms = result['terms']
+    assert term in terms
+
+
 @pytest.mark.django_db
 def test_categorize_item_fails_gracefully_if_term_not_found(item):
     response = categorize_item(

django/website/rest_api/views.py

@@ -50,8 +50,9 @@ class ItemViewSet(viewsets.ModelViewSet, BulkDestroyModelMixin):
             return Response(data, status=status.HTTP_400_BAD_REQUEST)
 
         item.apply_term(term)
-        data = {}  # TODO should be the item containing the new term
-        return Response(data, status=status.HTTP_200_OK)
+
+        serializer = ItemSerializer(item)
+        return Response(serializer.data, status=status.HTTP_200_OK)
 
 
 class TaxonomyViewSet(viewsets.ModelViewSet):