如何为MongoDB中的所有文档重命名字段?

问题描述：

假设我在MongoDB中有一个具有5000条记录的集合，每条记录都类似于:

Assuming I have a collection in MongoDB with 5000 records, each containing something similar to:

{
"occupation":"Doctor",
"name": {
   "first":"Jimmy",
   "additional":"Smith"
}

在所有文档中，是否有简便的方法将字段其他"重命名为最后"?我在文档中看到了 $ rename 运算符，但是我不清楚如何指定一个子字段.

Is there an easy way to rename the field "additional" to "last" in all documents? I saw the $rename operator in the documentation but I'm not really clear on how to specify a subfield.

答

您可以使用:

db.foo.update({}, {$rename:{"name.additional":"name.last"}}, false, true);

或者只更新包含该属性的文档:

Or to just update the docs which contain the property:

db.foo.update({"name.additional": {$exists: true}}, {$rename:{"name.additional":"name.last"}}, false, true);

上述方法中的false, true是:{ upsert:false, multi:true }.您需要multi:true来更新所有您的记录.

The false, true in the method above are: { upsert:false, multi:true }. You need the multi:true to update all your records.

或者您可以使用前一种方式:

Or you can use the former way:

remap = function (x) {
  if (x.additional){
    db.foo.update({_id:x._id}, {$set:{"name.last":x.name.additional}, $unset:{"name.additional":1}});
  }
}

db.foo.find().forEach(remap);

在MongoDB 3.2中，您也可以使用

db.students.updateMany( {}, { $rename: { "oldname": "newname" } } )

一般语法是

db.collection.updateMany(filter, update, options)

https://docs.mongodb.com/manual/reference /method/db.collection.updateMany/

如何为MongoDB中的所有文档重命名字段?

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