Mongodb 如何更改Mongo文档中嵌套字段的数据类型？

我的Mongo结构如下所示

"topProcesses" : [
        {
            "cpuUtilizationPercent" : "0.0",
            "processId" : "1",
            "memoryUtilizationPercent" : "0.1",
            "command" : "init",
            "user" : "root"
        },
        {
            "cpuUtilizationPercent" : "0.0",
            "processId" : "2",
            "memoryUtilizationPercent" : "0.0",
            "command" : "kthreadd",
            "user" : "root"
        },
        {
            "cpuUtilizationPercent" : "0.0",
            "processId" : "3",
            "memoryUtilizationPercent" : "0.0",
            "command" : "ksoftirqd/0",
            "user" : "root"
        },
        {
            "cpuUtilizationPercent" : "0.0",
            "processId" : "5",
            "memoryUtilizationPercent" : "0.0",
            "command" : "kworker/0:+",
            "user" : "root"
        },
        {
            "cpuUtilizationPercent" : "0.0",
            "processId" : "6",
            "memoryUtilizationPercent" : "0.0",
            "command" : "kworker/u3+",
            "user" : "root"
        },
        {
            "cpuUtilizationPercent" : "0.0",
            "processId" : "8",
            "memoryUtilizationPercent" : "0.0",
            "command" : "rcu_sched",
            "user" : "root"
        } 
    ]

现在在上面的文档中，

topProcesses.cpuUtilizationPercent

是字符串，我想将

topProcesses.cpuUtilizationPercent

数据类型更改为

Float

。为此，我在下面尝试了一下，但没有成功

db.collectionName.find({
   "topProcesses":{"$exists":true}}).forEach(function(data){
    for(var ii=0;ii<data.topProcesses.length;ii++){
   db.collectionName.update({_id: data._id},{$set:{"topProcesses.$.cpuUtilizationPercent":parseFloat(data.topProcesses[ii].cpuUtilizationPercent)}},false,true);
  }
})

db.collectionName.find({
“topProcesses”：{“$exists”：true}）.forEach（函数（数据）{
对于（var ii=0；ii您这样做是正确的，但是在
.update（）
的查询部分中没有包含要匹配的数组元素：

db.collectionName.find({
“topProcesses”：{“$exists”：true}）.forEach（函数（数据）{
对于（var ii=0；ii，您可以使用下面的查询将topProcesses.cpuUtilizationPercent的数据类型从字符串更新为浮点

db.db.find({"topProcesses.cpuUtilizationPercent" : {$exists : true}}).
forEach( function(obj)
{ obj.topProcesses.cpuUtilizationPercent = new ISODate(obj.topProcesses.cpuUtilizationPercent);
db.db.save(obj); } );