Mongoose simple model

course.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
mongoose.Promise = require('bluebird');

var courseSchema = new Schema({
    name:{ type : String, unique : true },
    description:{ type : String},
    tags:[
        { type : String }
    ],
    price : { type: Number }
});

var Course = mongoose.model('Course', courseSchema ,'Courses');

module.exports = Course;