如何从MongoDB文档中删除嵌套对象的属性? [英] How to remove property of nested object from MongoDB document?

问题描述

我有一个像这样的MongoDB文档:

I have a MongoDB document like this :

{
    "_id": ObjectId("5589044a7019e802d3e9dbc5"),
    "sessionId": LUUID("f49d4280-ced0-9246-a3c9-a63e68e1ed45"),
    "teamId": LUUID("6ef7d1a8-f842-a54c-bd8c-daf6481f9cfc"),
    "variableId": LUUID("59d1b512-eee2-6c4b-a5b5-dda546872f55"),
    "values": {
        "725400": 691.0000000000000000,
        "725760": 686.0000000000000000,
        "726120": 683.0000000000000000,
        "726480": 681.0000000000000000,
        "726840": 679.0000000000000000,
        "727200": 678.0000000000000000,
        "727560": 677.0000000000000000,
        "727920": 676.0000000000000000
    },
    "variableType": 2,
    "isSet": false,
    "teamNumber": 2,
    "simPageIds": []
}

我有一种情况，我必须从文档的"values"属性中删除一个特定的属性.例如，我想从"values"属性中删除值"727920".

I have a scenario that I have to delete a particular property from the "values" property of my document. for example, I want to delete value "727920" from the "values" property.

由于"Values"不是数组，因此在这里不能使用$pull.我需要删除

Since "Values" is not an array, I can't use $pull here. What I need is to remove

"727920" : 676.0000000000000000.

正确的做法是什么?

推荐答案

使用 $ unset 如下:

db.collectionName.update({},{"$unset":{"values.727920":""}})

编辑 要更新多个文档，请使用更新选项:

EDIT For updating multiple documents use update options like :

db.collectionName.update({},{"$unset":{"values.727920":""}},{"multi":true})

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