--- a/fruitbar/crud.py	Wed Jul 20 18:56:30 2016 +0800
+++ b/fruitbar/crud.py	Wed Jul 20 19:04:15 2016 +0800
@@ -60,7 +60,10 @@
         except (RecordNotFound, RecordDeleted):
             return '', 404
 
-        userdata = dict((k, v) for (k, v) in request.json.items() if k in self.safe_fields)
+        userdata = {
+            k: v for k, v in request.json.items()
+            if k in self.safe_fields
+        }
         doc.update(userdata)
         response = g.db.update(doc)