MongoDB:如何向集合中添加'id'字段?
我想在集合中添加一个id字段,数字从1开始。 例如 有一系列文章:MongoDB:如何向集合中添加'id'字段?,mongodb,Mongodb,我想在集合中添加一个id字段,数字从1开始。 例如 有一系列文章: {"_id" : ObjectId("98r498jfgragaja9ra4"),"titile":"foo","content":"foo..."} {"_id" : ObjectId("498aut89auhgua4940q"),"titile":"bar","content":"bar..."} {"_id" : ObjectId("30ua9ah984yhtauiga9"),"titile":"hello","conte
{"_id" : ObjectId("98r498jfgragaja9ra4"),"titile":"foo","content":"foo..."}
{"_id" : ObjectId("498aut89auhgua4940q"),"titile":"bar","content":"bar..."}
{"_id" : ObjectId("30ua9ah984yhtauiga9"),"titile":"hello","content":"hello..."}
添加id字段后,结果如下所示:
{"_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"}
如何做到这一点?MongoDB的文档提供了一些关于如何做到这一点的建议:
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