dinesh-rawat-dev / graphql

Graphql express app

Code Test : GraphQL

Overview

The website needs to have:

• An Administrator interface that should allow changes that would be reflected within the customer interface. The changes (mutations) are sent to a GraphQL endpoint. (/admin)
• Customer interface to query a GraphQL endpoint.(/)

Installation

npm i

Start in dev. mode

Server: npm start // Transpiles the code and start express server on port 3000

Client: npm run dev // Run the client app on port: 4200

Start in prod. mode

npm run build

Running unit test cases

npm run test

Code Samples

So the code structure is pretty straight forward. Its a custom structure that I have created for being used here

graphql
│   README.md
│   .babelrc                       // Babel presets and plugins
│   package.json
│   webpack.client.js              // Required only for front end application
│   webpack.server.js              // Required only for server-side express
│
└───src // Contains the source code
│   │   client.jsx            // Main react file: routes, injecting etc.
│   │   index.html         // HTML Template file
│   │   server.js     // Starts the node server, enabled CORS and graphql middlewares
│   │
│   └───app // React + Express
│   └────── frontend           // Components for customer and administrator
│   └──────────── components   // Contains: admin,customer components and styling
│   └──────────── redux  // State management: Actions, reducers, types and store
│   └────── server // Product controller and GraphQL schema and fake data
│

Customer Interface

On start of the application you will be redirected to the customer interface which runs on port: 4200 in local environment. Which queries the graphql endpoint and displays products in the page.

URL: http://localhost:4200/

See the image:

Administrator Interface

Admin interface allows the user to add new product and update any existing product in the store. For the purpose of simplicity, I have provided a link on the customer interface saying, "To be admin: simply change URL to Admin," which will redirect the user to

URL: http://localhost:4200/admin

See the image(s):

NOTE: The product images are totally irrelevant.

GraphQL Queries

Get all products:

query getProducts($name: String) {
      products(name: $name) {
          id,
          name,
          category,
          supplierName,
          description,
          productPicUrl,
          status
      }
}

Get productByProductId:

query getProduct($id: String!) {
        product(id: $id) {
                id,
                name,
                category,
                supplierName,
                description,
                productPicUrl,
                status
        }
}

Variables:

{
   "id": "HT-1002"
}

Add new product

mutation addNewProduct ($id: String!
       $category: String!
       $supplierName: String
       $description: String
       $productPicUrl: String
       $name: String!
       $status: Boolean) {
       addProduct (id: $id, category: $category, supplierName: $supplierName, description: $description,
       productPicUrl: $productPicUrl, name: $name, status: $status) {
           id,
           category,
           supplierName,
           description,
           productPicUrl,
           name,
           status
       }
 }

Variables:

{
    "id": "H-51043",
    "name": "Lenovo B480",
    "category": "Laptops"
  }

Update any product

mutation updateProduct ($id: String!
      $category: String!       
      $supplierName: String       
      $description: String       
      $productPicUrl: String       
      $name: String!       
      $status: Boolean) {       
  updateProduct (id: $id, category: $category, supplierName: $supplierName, description: $description,
      productPicUrl: $productPicUrl, name: $name, status: $status) {
          id,
          category,           
          supplierName,           
          description,           
          productPicUrl,           
          name,           
          status           
      }       
}

Variables:

{
   "id": "H-51043",   
   "name": "Lenovo B480 -my laptopt",   
   "category": "Laptops"   
 }

Delete any product

 query deleteProduct($id: String!) {
        products(id: $id) {       
            id            
        }        
  }

Variables:

{
  "id": "H-51043"    
}

Technologies

• Express
• Webpack
• Webpack-dev-server

Plugins used:

-- copy-web-pack-plugin

-- html-webpack-plugin

-- extract-text-webpack-plugin

• React

• Redux (Which doesn't looks relevant in this particular scenario)

• graphql

• express_graphql

• Jest for unit testing

• ES 6

NOTE:-

• Unit tests are done only for front-end. It checks the dom elements. Not test cases for express app