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Beginning Node.js, Express & MongoDB Development

Leaving Movie Reviews

Let's learn how to add reviews using the POST, PUT, and DELETE methods.

We'll cover the following...

In this lesson, we’ll learn how to leave reviews for movies.

MOVIEREVIEWS_DB_URI=mongodb+srv://admin:hello@cluster0.yjxj4.mongodb.net/sample_mflix?retryWrites=true&w=majority
MOVIEREVIEWS_NS=sample_mflix
PORT=5000
The initial files we will build on

So let’s create the routes to post, put, and delete reviews. The post method is for creating a review, put is for editing a review, and delete is for deleting reviews. In the route file movies.route.js, let’s add the routes, as shown below:

Javascript (babel-node)
import express from 'express'
import MoviesController from './movies.controller.js'
import ReviewsController from './reviews.controller.js'
const router = express.Router() 
router.route('/').get((req,res) => res.send(MoviesController.apiGetMovies))
router
  .route("/review") 
  .post(ReviewsController.apiPostReview) 
  .put(ReviewsController.apiUpdateReview) 
  .delete(ReviewsController.apiDeleteReview)   
export default router

Line 3: We import the ReviewsController, which we’ll create later.

Lines 6–11: We then add a /review route that handles post, put, and delete HTTP requests within this one route call. That is to say, if the /review route receives a post HTTP request to add a review, we call apiPostReview. If /review receives a put HTTP request to edit a review, we call apiUpdateReview. Finally, if /review receives a delete HTTP request to delete a review, we call apiDeleteReview.

Creating the review controller

Next, let’s create reviews.controller.js with the following code:

Javascript (babel-node)
import ReviewsDAO from '../dao/reviewsDAO.js'
 export default class ReviewsController{
     static async apiPostReview(req,res,next){
         try{
             const movieId = req.body.movie_id 
             const review = req.body.review
             const userInfo = {
                 name: req.body.name,
                 _id: req.body.user_id
             }
         
            const date = new Date()
            const ReviewResponse = await ReviewsDAO.addReview( 
                movieId,
                userInfo,
                review,
                date
            )
            res.json({ status: "success "}) 
         }catch(e){
             res.status(500).json({ error: e.message})
         }
     }
     static async apiUpdateReview(req,res,next){
        try{
           const reviewId = req.body.review_id 
           const review = req.body.review                    
           const date = new Date()
           const ReviewResponse = await ReviewsDAO.updateReview( 
               reviewId,
               req.body.user_id, 
               review,
               date
           )
           var { error } = ReviewResponse
           if(error){
               res.status.json({error})
           }
           if(ReviewResponse.modifiedCount === 0){
            throw new Error ("unable to update review. User may not be original poster")
           }
           res.json({ status: "success "}) 
        }catch(e){
            res.status(500).json({ error: e.message})
        }
    }  
    
    static async apiDeleteReview(req,res,next){
        try{
           const reviewId = req.body.review_id 
           const userId = req.body.user_id
           const ReviewResponse = await ReviewsDAO.deleteReview( 
               reviewId,
               userId, 
           )
           
           res.json({ status: "success "}) 
        }catch(e){
            res.status(500).json({ error: e.message})
        }
    }    
    
}

Line 1: We first import ReviewsDAO, which we’ll create later.

Lines 4–11: We get ...