om/database/message.model.js

const mongoose = require('mongoose');

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

const MessageSchema = mongoose.Schema({
    subject: { type: String, required: true },
    message: { type: String, required: true },
    user: { type: String, required: true },
    tag: [{type: String }],
    //createtime: { type: Date, default: Date.now },
});
MessageSchema.index({tag:'text'});

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