MongoDB - 基于嵌套数组的字段值更新数组对象中的字段

Question

我正在尝试更新对象数组中的字段，其中嵌套数组中的字段等于一个值。

我的目标是给picture字段设置一个新的url，其中valueList中的value字段是oldRed

产品架构：

{
    variations: [{
        id: 1,
        picture: 'https://example.picture.com',
        valueList: [{
            name: 'color',
            value: 'oldRed'
        }, {
            name: 'size',
            value: 'M'
        }]

    }, {
        id: 2,
        picture: 'https://example.picture.com',
        valueList: [{
            name: 'color',
            value: 'black'
        }, {
            name: 'size',
            value: 'M'
        }]

    }]
}

我得到的最接近的是感谢answer，我在其中更新了所有包含 :'oldRed' 的嵌套数组字段。但我的最终目标是根据嵌套数组字段更新其他字段picture。

db.Product.findOneAndUpdate({
    _id: '123'
}, {
    $set: {
        'variations.$[].valueList.$[nameField].value': 'newRed'
    }
}, {
    arrayFilters: [{
        'nameField.value': 'oldRed'
    }],
    new: true
}
});

Answer 1

请试试这个：

db.Product.findOneAndUpdate(
        { _id: 123 },
        {
            $set: {
                'variations.$[item].valueList.$[nameField].value': 'newRed',
                'variations.$[item].picture': 'newURL' // item is each object in variations which is being checked in arrayFilters.
            }
        },
        {
            arrayFilters: [{ 'item.valueList.value': 'oldRed' }, { 'nameField.value': 'oldRed' }],
            new: true
        }
   )

收集数据：

{
    "_id" : 123,
    "variations" : [ 
        {
            "id" : 1,
            "picture" : "https://example.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "oldRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }, 
                {
                    "name" : "color",
                    "value" : "oldRed"
                }
            ]
        }, 
        {
            "id" : 2,
            "picture" : "https://example.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "black"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }, 
        {
            "id" : 3,
            "picture" : "https://example3.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "oldRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }
    ]
}

结果：

/* 1 */
{
    "_id" : 123,
    "variations" : [ 
        {
            "id" : 1,
            "picture" : "newURL",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "newRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }, 
                {
                    "name" : "color",
                    "value" : "newRed"
                }
            ]
        }, 
        {
            "id" : 2,
            "picture" : "https://example.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "black"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }, 
        {
            "id" : 3,
            "picture" : "newURL",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "newRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }
    ]
}