Question

如何拉出具有键address1

的内部数组

"_id": 2,
"info": {
    "address1": {
        "city": {
            "0": "Indore"
        },
        "state": {
            "0": "MP"
        }
    },
    "address2": {
        "city": {
            "0": "Mhow"
        },
        "state": {
            "0": "MP"
        }
    }
}

删除数据后应该是：

"_id": 2,
"info": {
    "address1": {
        "city": {
            "0": "Indore"
        },
        "state": {
            "0": "MP"
        }
    }
}

我用过这个db.info.update({"_id":2},{'$pull':{"info":{"address1":{'$exists':true}}}}) 但它给出了错误Cannot apply $pull/$pullAll modifier to non-array

Answer 1

在我看来，你真正想要的是一系列地址，对吧？那么你的用户可以拥有无限的地址？如果是这样，你应该有一个数组，如下所示：

"_id": 2,
"info": {
    "address": [{
        "city": {
            "0": "Indore"
        },
        "state": {
            "0": "MP"
        }
    },
     {
        "city": {
            "0": "Mhow"
        },
        "state": {
            "0": "MP"
        }
    }]
}

现在将地址作为数组，您可以使用$ push和$ pull

Answer 2

来自mongo控制台：

> db.tester.find()
{ "_id" : 2, "info" : { "address1" : { "city" : { "0" : "Indore" }, "state" : { "0" : "MP" } }, "address2" : { "city" : { "0" : "Mhow" }, "state" : { "0" : "MP" } } } }
> db.tester.findAndModify({query: {"_id":2}, update : {$unset: {"info.address2":1}}, new:true})
{
    "_id" : 2,
    "info" : {
        "address1" : {
            "city" : {
                "0" : "Indore"
            },
            "state" : {
                "0" : "MP"
            }
        }
    }
}
> db.tester.find()
{ "_id" : 2, "info" : { "address1" : { "city" : { "0" : "Indore" }, "state" : { "0" : "MP" } } } }

这是否能满足您的需求？

仅使用mongodb和php中的关联键来拉取数据

2 个答案: