Using mongoose just for data validation, set(_id, false) and toObject(), incorrect result

[skiv71]

Hi, just testing some code, which... to my mind should be straight forward, yet is isn't working as expected...

function Sch(o, insert) {
    if (insert)
        return new Schema(schema)
    var s = new Schema()
    s.set(`_id`, false)
    Object.keys(o)
        .forEach(key => s.add({ [key]: schema[key] }))
    return s
}

async function main(insert) {
    var u = { name: `Neil`, firmId: `5f4ebb71f5332b0011bb0bd5` }
    var Model = mongoose.model(`User`, Sch(u, insert))
    var m = new Model(u)
    m.validate()
    console.log(m.toObject())
}

main()

which, produces...

options: {
    typePojoToMixed: true,
    typeKey: 'type',
    id: true,
    noVirtualId: false,
    _id: false,
    noId: false,
    validateBeforeSave: true,
    read: null,
    shardKey: null,
    autoIndex: null,
    minimize: true,
    discriminatorKey: '__t',
    optimisticConcurrency: false,
    versionKey: '__v',
    capped: false,
    bufferCommands: true,
    strictQuery: false,
    strict: true
  }
}
{
  _id: 5f52e93eeb1953237678ce46,
  name: 'Neil',
  firmId: 5f4ebb71f5332b0011bb0bd5
}

I've set _id false, but I see it also has other flags, but regardless, my output object contains the _id - which I don't want?

[skiv71]

I've tried forcing them other flags, to no avail. Is this a bug in the *.toObject() method?

I see it has options, but none to remove the _id field?

[skiv71]

I can confirm, when creating new Schema(), is i use the args null, { _id: false }, i get the desired result... so the schema.set(o, v) doesn't work (for me)