NodeJS and MongoDB - Array of ObjectId how to return Objects

Question

I have in a collection an reference array of ObjectId. And I want to return the object's data linked with those Ids in the json response.

retrieveFromUser: function( req, res ) {
    var user_id =   req.params.user_id;
    User.findById( user_id, function( err, user ) {
        if( err ) {
            res.send( 404, "Unable to find user");
        } else {
            // This returns the array but I want the objects data
            return res.json( user.constructions );
        }
    });
}

How can I do that ?
thanks a lot !

If you do <code>console.log(user.constructions)</code> what is the result? — Krasimir
– Krasimir, Commented Oct 10, 2013 at 8:24

krasu · Accepted Answer · 2013-10-11 10:14:42Z

2

Try to use populate() method

retrieveFromUser: function( req, res ) {
 var user_id =   req.params.user_id;
    User.findOne({ _id: user_id }).populate('constructions').exec(function( err, user ) {
        if( err ) {
            res.send( 404, "Unable to find user");
        } else {
            // This returns the array but I want the objects data
            return res.json( user.constructions );
        }
    });
}

edited Oct 11, 2013 at 10:14

answered Oct 10, 2013 at 8:40

krasu

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5 Comments

MaT Over a year ago

Unfortunately, I am getting a TypeError: Cannot call method 'populate' of undefined...

krasu Over a year ago

@MaT, are you using mongoose? Which version of mongoose you are using?

MaT Over a year ago

Yes, I am using Mongoose 3.6.20. And if I use findOne, I have the undefined error.

krasu Over a year ago

All mongoose find methods returns Query objects mongoosejs.com/docs/api.html#query_Query (ref github.com/LearnBoost/mongoose/blob/master/lib/model.js#L880, mongoosejs.com/docs/queries.html) and findById it is just wrapper around findOne. All Query objects have populate methods, try to check it by yourself by console.log(User.findOne({ _id: user_id }))

MaT Over a year ago

I solved my error, this was due to a wrapped function. Thanks a lot !

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