更新嵌套的mongodb文档

Question

我正在寻找解决方案，我可以更新深层嵌套的mongodb文档， 我尝试使用$ sign，但它又有一个限制，它只能使用一次，这对原因没有帮助。那么，我有什么方法可以做到这一点。 我的文件看起来像

{
    "_id" : ObjectId("56fa1a0d8c54754a27ab7a50"),
    "name" : "A",
    "location" : [ 
        {
            "state" : "MH",
            "city" : [ 
                {
                    "cityID" : 11,
                    "cityName" : "nashik"
                }, 
                {
                    "cityID" : 12,
                    "cityName" : "mumbai"
                }, 
                {
                    "cityID" : 13,
                    "cityName" : "pune"
                }
            ]
        }, 
        {
            "state" : "GJ",
            "city" : [ 
                {
                    "cityID" : 21,
                    "cityName" : "gandhiNagar"
                }, 
                {
                    "cityID" : 22,
                    "cityName" : "surat"
                }, 
                {
                    "cityID" : 23,
                    "cityName" : "ahemdabad"
                }
            ]
        }
    ]
}

,
{
    "_id" : ObjectId("56fa1ab88c54754a27ab7a51"),
    "name" : "B",
    "location" : [ 
        {
            "state" : "MH",
            "city" : [ 
                {
                    "cityID" : 11,
                    "cityName" : "nashik"
                }, 
                {
                    "cityID" : 12,
                    "cityName" : "mumbai"
                }, 
                {
                    "cityID" : 13,
                    "cityName" : "pune"
                }
            ]
        }, 
        {
            "state" : "GJ",
            "city" : [ 
                {
                    "cityID" : 21,
                    "cityName" : "gandhiNagar"
                }, 
                {
                    "cityID" : 22,
                    "cityName" : "surat"
                }, 
                {
                    "cityID" : 23,
                    "cityName" : "ahemdabad"
                }
            ]
        }
    ]
}

,
{
    "_id" : ObjectId("56fa1ac98c54754a27ab7a52"),
    "name" : "A",
    "location" : [ 
        {
            "state" : "MH",
            "city" : [ 
                {
                    "cityID" : 11,
                    "cityName" : "nashik"
                }, 
                {
                    "cityID" : 12,
                    "cityName" : "mumbai"
                }, 
                {
                    "cityID" : 13,
                    "cityName" : "pune"
                }
            ]
        }, 
        {
            "state" : "GJ",
            "city" : [ 
                {
                    "cityID" : 21,
                    "cityName" : "gandhiNagar"
                }, 
                {
                    "cityID" : 22,
                    "cityName" : "surat"
                }, 
                {
                    "cityID" : 23,
                    "cityName" : "ahemdabad"
                }
            ]
        }
    ]
}

所以现在我想更新字段cityName，其中名称：“A”和cityID：23

为此我写了一个查询，但它有静态索引，

db.LevelTest.update({"name":"A","location.city.cityID":23},{$set:{"location.$.city.2.cityName":"newCity"}},false,true)

那么有什么方法可以编写通用查询而不是提供数组元素的静态索引，或任何其他方法， 或改变结构是唯一的解决方案？