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"])