https://github.com/RisingStack/graffiti-mongoose
https://blog.risingstack.com/graffiti-mongoose-mongodb-for-graphql/
https://blog.risingstack.com/start-using-graphql-with-graffiti/
Graphql graffiti
原文：http://www.cnblogs.com/qiangxia/p/5661276.html
