Add a field to existing MongoDB document (with Mongoose in Node.js)

问题

I have this existing document in a collection Article in MongoDB database:

[ { site: 'www.atlantico.fr',
date: '2014-05-27T11:10:19.000Z',
link: 'http://www.atlantico.fr/example.html',
_id: 538473817eb00f082f4803fc,
__v: 0} ]

I want to add a new field day with value 'example' to this document, using Mongoose in Node.js. So I do:

Article.update(
      { link: 'http://www.atlantico.fr/example.html'}, 
      { $set : {day : 'example'} }, 
       function(err){  
                    });

But it does not work because when I query the document after that, no new field day appears...

I must have made a mistake when using update or $set in Mongoose, but I cannot find exactly my mistake.

What am I missing? Thanks!

回答1:

try

Article.update(
     {link: 'http://www.atlantico.fr/example.html'}, 
     {day : 'example' },
     {multi:true}, 
       function(err, numberAffected){  
       });

and don't forget to add day to schema.

回答2:

Article.findByIdAndUpdate(id, { $set: { day: 'example' }}, { new: true }, function (err, article) {
  if (err) return handleError(err);
  res.send(article);
});

I prefer this way because it's contains a callback function.

reference and more info: http://mongoosejs.com/docs/documents.html

回答3:

await Users.updateOne( {link: 'http://www.atlantico.fr/example.html'},{ $set: { day : 'example'} }, { multi: true });

update is deprecated
use await for db operation
if you want to add new filed in collection ,first check it is added in Model or not (if you don't wan't use that filed as mandatory make is as "required: false")

来源：https://stackoverflow.com/questions/23959287/add-a-field-to-existing-mongodb-document-with-mongoose-in-node-js

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