Truefit Service

The TrueFit service is a small REST web service that can be used to retrieve products, submit fit details, and retrieve fit details. It's written in Typescript (Javascript) and used Express. For more details, on how to use the service, view the usage section below.

Requirements

Before starting, please ensure that all dependencies are installed.

• Node (8 or above) and NPM
• Postgres

Getting Started

Getting started with this service isn't much different than any other Node/Express application. The only difference is that you must transpile the Typescript code before starting the server. Follow these steps to get the service up and running.

Setup

Before running the application, you must first install all dependencies using NPM.

npm install

Configuration

This application uses a .env file fo configuration values. To get started, copy the .env.dist file.

cp .env.dist .env

Then, change the following variables to whatever makes sense for your machine.

• PORT

  The port that the server will start on, defaults to 8080.

• DATABASE_HOST

  The hostname of the database server to connect to, defaults to localhost.

• DATABASE_USERNAME

  The username to use when connecting to the database server, defaults to empty string.

• DATABASE_PASSWORD

  The passwprd to use when connecting to the database server, defaults to empty string.

• DATABASE_DATABASE

  The database to use when connecting to the database server, defaults to truefit.

Database Setup

In a real application, we would write migration scripts to manage the database schema in the same way we manage application releases. In this case, for simplicity, this application assumes that you have already run the following SQL statements to setup the database.

CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

CREATE TABLE product_fits (
    id uuid DEFAULT uuid_generate_v4 () PRIMARY KEY,
    product uuid NOT NULL,
    fit smallint NOT NULL
);
	
CREATE INDEX product_fits_product_index ON product_fits(product);

Compilation

Since this is a Typescript application, you must also transpile the code into Javascript before executing it. Once complete, a runnable version of the code will be saved in the ./dist directory where it can be run.

npm run build

Running

Once setup, it's time to start the server and make it available for use.

npm run server

You can also run the service with nodemon in development to automatically recompile and restart the server when changes are detected.

npm run hot

Regardless of how you start it, the service will be available for use at localhost:8080.

Testing

This program comes packages with a test suite that you can fun as follows.

npm run test

Once run, you can view coverage reports in the ./coverage directory. Note that this application only has a couple tests available at the moment. In a real application, there would be much better test coverage. Enough tests were provided for illustrative purpose... they do not represent a full suite as would be expected for a non-example application.

Usage

This service provides the following operations.

• GET /products

  Retrieve all available products.

  Response

  Content-Type: application/json
  
  {
    "products": [
      {
        "id": "1d47bc4ab32d4c5ba694c5664825e605",
        "brand": "Adidas",
        "name": "Yeezy",
        "fit": 3
      }
    ]
  }
  

• GET /products/:id

  Retrieve a single product.

  Response

  Content-Type: application/json
  
  {
      "id": "1d47bc4ab32d4c5ba694c5664825e605",
      "brand": "Adidas",
      "name": "Yeezy",
      "fit": 3
  }
  

• GET /products/:id/fits

  Retrieve all fit data for a given product.

  Response

  Content-Type: application/json
  
  {
    "fits": [
      {
        "fit": 3,
        "product": "1d47bc4ab32d4c5ba694c5664825e605"
      }
    ]
  }
  

• POST /products/:id/fits

  Submit fit data for a given product.

  Request

  POST /products/:id/fits
  Content-Type: application/json
  
  {
    "fit": 3
  }