CODEWITHSUNDEEP
node.jsmongodbexpressmongoose
MischievousChild
MischievousChild

Reputation: 151

Problems with Mongoose populate

Game schema

const { Schema, model } = require('mongoose');

const gameSchema = Schema({
  _id: Schema.Types.ObjectId,
  name: { type: String, required: true },
  description: String,
  calc: [{ type: Schema.Types.ObjectId, ref: 'Calc' }]
});

module.exports = model('Game', gameSchema);

Calc schema

const { Schema, model } = require('mongoose');

const calcSchema = Schema({
  _id: Schema.Types.ObjectId,
  preset: { type: String, required: true },
  datasets: [{ type: Schema.Types.ObjectId, ref: 'Dataset' }],
  model: String,
});

module.exports = model('Calc', calcSchema, 'calc');

GET Games route

router.get('/', passport.authenticate('jwt', { session: false }), (req, res) => {
  Game.find()
    .select('_id name calc')
    .populate('calc')
    .then(games => res.status(200).json(games))
    .catch(err => res.status(500).json({ error: err }));
});

Instead of populating calc property with Calc objects, replacing the ids, calc property turns into an empty array. How do I use populate correctly? Is there an obvious mistake I made in my code?

In short: populate() results in calc: [] instead of calc: [{Calc object}, ...]

Upvotes: 1

Views: 491

Answers (1)

Yannick Loriot
Yannick Loriot

Reputation: 7136

In your case you are trying to populate an array of document (and not only one document) so you should use the Model.populate() method instead.

Game.find()
  .select('_id name calc')
  .then(games => Game.populate(games, { path: 'calc' }))
  .then(games => res.status(200).json(games))
  .catch(err => res.status(500).json({ error: err }));

Upvotes: 1

Related Questions