use data as key for all resource-lists

api/resources/categories.py

@@ -8,7 +8,7 @@ mod = Blueprint('categories', __name__, url_prefix='/categories')
 @mod.route("/", methods=["GET"])
 def list():
     categories = Category.query.all()
-    return jsonify(categories=[c.to_json() for c in categories])
+    return jsonify(data=[c.to_json() for c in categories])
 
 
 @mod.route("/<int:id>", methods=["GET"])

api/resources/designers.py

@@ -10,7 +10,7 @@ mod = Blueprint('designers', __name__, url_prefix='/designers')
 @mod.route("/", methods=["GET"])
 def list():
     designers = Designer.query.all()
-    return jsonify(designers=[d.to_json() for d in designers])
+    return jsonify(data=[d.to_json() for d in designers])
 
 
 @mod.route("/", methods=["POST"])

tests/resources/test_designers.py

@@ -28,7 +28,7 @@ class TestEndpoints(flask_testing.TestCase):
         self._add_designer('designer1')
         self._add_designer('designer2')
         response = self.client.get("/designers/")
-        self.assertEqual(2, len(response.json.get('designers')))
+        self.assertEqual(2, len(response.json.get('data')))
 
     def test_get_designer(self):
         designer = self._add_designer('designer1')