Doctor's Signup API Post Request

Signup.Doctor.js

var express 			= require('express'),
	UserService 		= require('../../services/UserService'),
	SubscriptionService = require('../../services/SubscriptionService'),
	Joi 				= require('joi'),
	joiful 				= require('../../lib/joiful'),
    router 				= express.Router();

var SignupDoctorPostSchema = Joi.object().keys({
	username: Joi.string().required(),
	email: Joi.string().email().required(),
	password: Joi.string().required(),
	plan: Joi.string().required() 
}).required();

function SignupDoctorPostRequest(data) {
	this.validatePlanId = function() {
		return SubscriptionService.hasValidPlan(data.plan);
	};

	this.createUser = function () {
		return UserService.save(data);
	};

	this.subscribeUser = function () {
		return SubscriptionService.create(data);
	};
}

router.post('/', function (rq, response) {
	var validation = SignupDoctorPostSchema.validate(rq.body);

	if(validation.error) {
		response.
		  status(422).
		  json({
		  	status: 'fail',
		  	data: joiful.parseValidationError(validation.error)
		  });
		return;
	}

	var request = new SignupDoctorPostRequest(validation.value);

	request.validatePlanId()
	.then(request.createUser)
	.then(request.subscribeUser)
	.then(
		function Success (authenticatedUser) {
		  response.status(201).json({});
		}
	)
	.catch(
		function Fail (fail) {
	      var statusCode = fail.type === 'Validation' ? 422 : 500;
	      var responseStatus = fail.type === 'Validation' ? 'fail' : 'error';
	      var responseData = fail.type === 'Validation' ? fail.details : fail.message;

	      response.
	        status(statusCode).
	        json({
	          status: responseStatus,
	          data: responseData
	        });
	    }
	);
});

module.exports = router;