使用 Mongo 查询将数组中的旧值 "V1" 更新为新值 "V11"

Question

我的数据结构如下：

{
    "metadata" : {
        "custom_metadata" : [
            {
                "key_id" : "6052e700dc84ef7d492b5d30",
                "type" : "freetext",
                "value" : [
                    "desh",
                    "Fauji"
                ]
            }
        ],
        "tag_ids" : [ ],
        "category_id" : "5a02e20a23dfee730bbd7f4f",
    }
}

我想使用 db.update() 查询在此处（不知道其索引）更新“值”数组中的特定值。示例：我想将上述文档更新为：

{
    "metadata" : {
        "custom_metadata" : [
            {
                "key_id" : "6052e700dc84ef7d492b5d30",
                "type" : "freetext",
                "value" : [
                    "Desh ki Dharti",
                    "Fauji"
                ]
            }
        ],
        "tag_ids" : [ ],
        "category_id" : "5a02e20a23dfee730bbd7f4f",
    }
}

Answer 1

演示 - https://mongoplayground.net/p/EypYAuHQTh3

使用$[]

The filtered positional operator $[] identifies the array elements that match the arrayFilters conditions for an update

db.collection.update({},
    { $set: { "metadata.custom_metadata.$[].value.$[value]": "Desh ki Dharti" }},
    { arrayFilters: [ { "value": "desh" } ]}
)

更新

演示 - https://mongoplayground.net/p/OCUyZXE8Dse

db.collection.update(
  { "metadata.custom_metadata.value": "desh" }, // query to find matching documents where value is "desh"
  { $set: { "metadata.custom_metadata.$[].value.$[v]": "Desh ki Dharti" } },
  { arrayFilters: [ { "v": "desh" } ]}
)

使用 Mongo 查询将数组中的旧值 "V1" 更新为新值 "V11"

Update an old value "V1" in an array to the new value "V11" using Mongo Query

arrays

key-value

mongodb

pymongo

mongodb-query