[mongodb] How can I rename a field for all documents in MongoDB?

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

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

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.

If ever you need to do the same thing with mongoid:

Model.all.rename(:old_field, :new_field)

UPDATE

There is change in the syntax in monogoid 4.0.0:

Model.all.rename(old_field: :new_field)

If you are using MongoMapper, this works:

Access.collection.update( {}, { '$rename' => { 'location' => 'location_info' } }, :multi => true )

please try db.collectionName.update({}, { $rename : { 'name.additional' : 'name.last' } }, { multi: true } )

and read this :) http://docs.mongodb.org/manual/reference/operator/rename/#_S_rename

I am using ,Mongo 3.4.0

The $rename operator updates the name of a field and has the following form:

{$rename: { <field1>: <newName1>, <field2>: <newName2>, ... } }

for e.g

db.getCollection('user').update( { _id: 1 }, { $rename: { 'fname': 'FirstName', 'lname': 'LastName' } } )

The new field name must differ from the existing field name. To specify a in an embedded document, use dot notation.

This operation renames the field nmae to name for all documents in the collection:

db.getCollection('user').updateMany( {}, { $rename: { "add": "Address" } } )

db.getCollection('user').update({}, {$rename:{"name.first":"name.FirstName"}}, false, true);

In the method above false, true are: { upsert:false, multi:true }.To update all your records, You need the multi:true.

Rename a Field in an Embedded Document

db.getCollection('user').update( { _id: 1 }, { $rename: { "name.first": "name.fname" } } )

use link : https://docs.mongodb.com/manual/reference/operator/update/rename/

Anyone could potentially use this command to rename a field from the collection (By not using any _id):

dbName.collectionName.update({}, {$rename:{"oldFieldName":"newFieldName"}}, false, true);

see FYI

This nodejs code just do that , as @Felix Yan mentioned former way seems to work just fine , i had some issues with other snipets hope this helps.

This will rename column "oldColumnName" to be "newColumnName" of table "documents"

var MongoClient = require('mongodb').MongoClient
  , assert = require('assert');

// Connection URL
//var url = 'mongodb://localhost:27017/myproject';
var url = 'mongodb://myuser:[email protected]:portNumber/databasename';

// Use connect method to connect to the server
MongoClient.connect(url, function(err, db) {
  assert.equal(null, err);
  console.log("Connected successfully to server");

  renameDBColumn(db, function() {
    db.close();
  });

});

//
// This function should be used for renaming a field for all documents
//
var renameDBColumn = function(db, callback) {
  // Get the documents collection
  console.log("renaming database column of table documents");
  //use the former way:
  remap = function (x) {
    if (x.oldColumnName){
      db.collection('documents').update({_id:x._id}, {$set:{"newColumnName":x.oldColumnName}, $unset:{"oldColumnName":1}});
    }
  }

  db.collection('documents').find().forEach(remap);
  console.log("db table documents remap successfully!");
}