我有一个json对象,如下所示:

{ "_id" : ObjectId("508806803bb97dc546e6f307"), "user_name" : "user1", "user_id" : 45645645, "likes" : [ { "event_id" : NumberLong("4578541212") },{ "event_id" : NumberLong("4578541213") } ], "dislikes" : [ ] }


我正在尝试通过Java驱动程序在Likes数组中删除特定事件
尝试首先在shell中执行此操作:

> db.users.update( {'likes.event_id' : 4578541212}, { '$unset':{'likes.event_id'
:1}})


没运气...我该怎么办呢?

最佳答案

如果只想从数组元素中删除event_id字段:

db.users.update( {'likes.event_id' : 4578541212}, {'$unset':{'likes.$.event_id' :1}})


使用$pull运算符删除元素:

db.users.update({'likes.event_id': 4578541212}, {'$pull':{likes: {event_id: 4578541212}}})

07-24 09:37
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