MongoDB：如何將一個`id`字段添加到集合中？

Question

我想將一個id字段添加到集合中，編號從1開始。 例如， 有一個收集的文章：

{"_id" : ObjectId("98r498jfgragaja9ra4"),"titile":"foo","content":"foo..."} 
{"_id" : ObjectId("498aut89auhgua4940q"),"titile":"bar","content":"bar..."} 
{"_id" : ObjectId("30ua9ah984yhtauiga9"),"titile":"hello","content":"hello..."} 

加入id後場

，結果是這樣的：

{"_id" : ObjectId("98r498jfgragaja9ra4"),"titile":"foo","content":"foo...","id":"1"} 
{"_id" : ObjectId("498aut89auhgua4940q"),"titile":"bar","content":"bar...","id":"2"} 
{"_id" : ObjectId("30ua9ah984yhtauiga9"),"titile":"hello","content":"hello...","id":"3"} 

怎麼辦呢？

Answer 1

MongoDB的文檔提供了有關如何做到這一點一些建議：

https://docs.mongodb.com/v3.0/tutorial/create-an-auto-incrementing-field/