MERN Stack Learning App
Back - End - users.js const express = require ( "express" ); const Course = require ( "../mongoose/models/courses" ); //setting up the student router const usersRouter = express . Router (); //write your code here //Post Method usersRouter . post ( '/courses/enroll/:id' , async ( req , res , next ) => { const id = req . params . id ; const course = await Course . findById ( id ); try { if ( course . isApplied ) { return res . status ( 403 ). send ({ "message" : "You have already applied for this course" }) } course . isApplied = true ; await course . save (); return res . status ( 200 ). send ({ "mess...