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Learn to build and deploy a full-stack MERN application. Gain insights into MongoDB basics, Node.js backend, and React frontend. Explore API testing and Heroku deployment.

Beginning Node.js, Express & MongoDB Development.png

MERN.tar.gz

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In this course, you’ll learn how to build a full-stack application using the MERN stack and deploy it to the internet. The MERN stack is a popular stack of technologies that build modern Single Page Applications (SPAs).

You’ll begin with the basics of MongoDB and the process of setting it up. Next, you will go over work with the Atlas cloud database. Then, you’ll learn how to set up the backend using Node and express. Also, you’ll be creating a fully functional movie review application. After creating the controller and data access objects, you’ll learn to create routes. Next, you’ll test the created API. Finally, you’ll learn how to create the frontend using the React components and deploy the application on Heroku.

By the end of this course, you’ll learn how to connect both the backend and the frontend to create a full-stack MERN application, as well as how to deploy it.

Beginning Node.js, Express & MongoDB Development



In this lesson, we'll create a controller to access the `moviesDAO.js` file, which we created previously.



import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


React

Dart

GoJS React

Typescript React

Vue.js


## Creating a movie controller

In the `api` folder, let's create a new file `movies.controller.js` with the following code:


import MoviesDAO from '../dao/moviesDAO.js' 
export default class MoviesController{
    static async apiGetMovies(req,res,next){
        const moviesPerPage = req.query.moviesPerPage ?
parseInt(req.query.moviesPerPage) : 20
        const page = req.query.page ? parseInt(req.query.page) : 0
        let filters = {} 
        if(req.query.rated){
            filters.rated = req.query.rated 
        }
        else if(req.query.title){ 
            filters.title = req.query.title
        }
        const { moviesList, totalNumMovies } = await MoviesDAO.getMovies({
            filters, 
            page, 
            moviesPerPage
            })
        let response ={
            movies: moviesList,
            page: page,
            filters: filters, 
            entries_per_page: moviesPerPage, 
            total_results: totalNumMovies
        }
        res.json(response) 
    }
}

**Line 1:** We first import `MoviesDAO` from the the `dao` directory. 


**Lines 3–6**: We call `apiGetMovies` via a URL. There's a query string in the response object `req.query` in which specific filter parameters might be defined and passed in through key-value pairs. For example, we have a URL `/api/v1/movies?title=dragon&moviesPerPage=15&page=0`. The `req.query` in this case would return the following JavaScript object after parsing the query string:

```sh
{
    title: “dragon”, moviesPerPage:"15", page: "0"
}
```
> **Note:** We check if `moviesPerPage` exists and parse it into an integer. We do the same for the `page` query string.



**Lines 7–13:** We start with an empty `filters` object. We check if the `rated` query string exists, then add it to the `filters` object. We do the same for the `title`.


**Lines 14–26**: We call the `getMovies` method in `MoviesDAO` that we've just implemented. Remember that the  `getMovies` method will return `moviesList` and `totalNumMovies`. We then send a JSON response with the response object above to whoever calls this URL.

Let's learn how to create a controller that the route file can use to access the dao file.

Introduction and Setting up the Database

Setting up the Backend

Setting up the Frontend : Creating the Server

Setting up the Frontend: Creating the React Components

Deployment

Conclusion

Creating the Movies Controller

Creating a movie controller