om/message.model.js

const mongoose = require('mongoose');

//const Schema = mongoose.Schema,
//ObjectId = Schema.ObjectId;

const MessageSchema = mongoose.Schema({
    //_id: ObjectId,
    /*id: {
        type: String,
        getter: function(val) { return this._id.toString(); },
        unique: true
    },*/
    //id: {type: String, required: true},
    subject: { type: String, required: true },
    message: { type: String, required: true },
    user: { type: String, required: true },
    tag: {type: [String] },
});

module.exports = mongoose.model('Message', MessageSchema);