use marshmallow to persist memes

mealapi/resources/mealresource.py

@@ -16,9 +16,7 @@ class MealBaseResource(Resource):
         body = request.get_json()
 
         try:
-            mealobj = self.mealschema.load(body)
-            db.session.add(mealobj.data)
-            db.session.commit()
+            self.mealschema.load(body, session=db.session)
             return '', 204
         except ValidationError as error:
             abort(406, error.messages)