Mongoose: Find from reference object document

Question

I am trying to search data from collection.

Model for 'USER' collection:

var model = new Schema({
    userName: String,
    password: String
});
module.exports = mongoose.model('user', model);

Model for 'BLOG'

var model = new Schema({
    title: String,
    createdBy: { type: Object, ref: 'user' }
});
module.exports = mongoose.model('blog', model);

My search code for blog collection:

objModel.find({ 'createdBy.userName': 'test_user' }).populate('createdBy')
.exec(function (err, lstBlog) {
    console.log(lstBlog.length);
});

But not able to get any record. There are 2 record in database for 'test_user'.

Answer 1

You need to make some changes in your 'BLOG' model :

var mongoose = require('mongoose');
var SCHEMA = mongoose.Schema;

var model = new Schema({
    title: String,
    createdBy: { type: SCHEMA.Types.ObjectId, ref: 'user' }
});

module.exports = mongoose.model('blog', model);

and then the following query will work

blog.find({}).populate(
      {
        path: 'createdBy',
        match: {'userName': 'test_user' }
      }
    ).exec(function (err, lstBlog) {
    console.log(lstBlog.length);
});;