const uniqueValidator = require('mongoose-unique-validator'); module.exports = mongoose => { var schema = mongoose.Schema( { message_name: String, message_group: Number, language: String, message_body: String, message_title: String, site: Number }, { collection: 'message_template', timestamps: true } ); schema.method("toJSON", function() { const { __v, _id, ...object } = this.toObject(); object.id = _id; return object; }); schema.plugin(uniqueValidator); const Message = mongoose.model("message", schema); return Message; };