Mongoose can't push new obejct to parent array - node.js

Question

I've got the following mongoose models:
Place.js
const mongoose = require("mongoose")
const Schema = mongoose.Schema
const placeSchema = new Schema({
title: { type: String, require: true },
filename: { type: String, require: true },
lociSets: [{ type: Schema.Types.ObjectId, ref: 'LociSet'}]
})
module.exports = mongoose.model("places", placeSchema)
LociSet.js
const mongoose = require("mongoose")
const Schema = mongoose.Schema
const LociSchema = require('./Locus')
const lociSetSchema = new Schema({
title: { type: String, require: true },
creator: { type: Schema.Types.ObjectId, ref: 'User' },
public: { type: Boolean, default: true },
loci: [LociSchema]
})
module.exports = mongoose.model("lociSets", lociSetSchema)
Locus.js
const mongoose = require("mongoose")
const Schema = mongoose.Schema
const locusSchema = new Schema({
position: {
x: { type: Number, require: true },
y: { type: Number, require: true },
z: { type: Number, require: true }
}
})
module.exports = locusSchema
Problem:
I try to insert a new LociSet into the lociSet array of Place like so:
exports.createOne = async (req, res) => {
const {
title,
public = true,
loci = []
} = req.body
console.log(title,public,loci,req.user.id)
const lociSet = new LociSet({
title,
public,
loci,
creator: req.user.id
})
try {
const place = await Place.findOne({
"title": req.params.title.toLowerCase()
})
console.log(lociSet)
await lociSet.save()
await place.lociSets.push(lociSet)
await place.save()
} catch (err) {
res.status(500).send({
message: "Some error occurred while creating the loci set.", err
});
}
}
But then I get an error message saying "Cast to [undefined] failed for value \"[{\"title\":\"Test set\",\"creator\":\"5a7898c403999200c4ee3ae5\",\"public\":\"true\"}]\" at path \"lociSets\""
The LociSet model is created without problems, but it seems to break when I try to save the place model

Answer 1

Because lociSets is an array of ObjectId references, you may want to try the following approach:
exports.createOne = async (req, res) => {
const { title, public = true, loci = [] } = req.body
const lociSet = new LociSet({
title,
public,
loci,
creator: req.user.id
})
try {
const newLociSet = await lociSet.save()
const place = await Place.findOneAndUpdate(
{ "title": req.params.title.toLowerCase() },
{ "$push": { "lociSets" : newLociSet._id } },
{ "new": true}
)
res.status(200).json(place)
} catch (err) {
res.status(500).send({
message: "Some error occurred while creating the loci set.", err
})
}
}