maxmiliano / callbell-fullstack-assignment

Full Stack Test for developers interviewing for Callbell 🛎

Callbell Full Stack Test

Hi there 👋 Thanks for taking the time to do this test! We hope that you're going to have fun!

The goal here is to allow you to build an MVP of a Trello Clone Board giving you a limited time.

We'll discuss your work (choices, code syntax, mistakes if there are some, etc.) during a review call after you have completed the assignment.

⚠️ Carefully read all the instructions, then give yourself a limited time.

If you struggle to finish it, value your time and don't spend days on it. Just submit your best effort.

⚠️ If you think something is wrong with the test (doesn't run as expected, missing instructions, ...), please email me at [email protected].

🚀 Objectives

The goal of this full stack test is to assess your skills on:

• Installing and running a Rails development environment;
• Making API calls to third-party services;
• Manipulating webhooks;
• Writing some unit tests with Rspec;
• Understanding basics of performance and security;
• Adapting to an existing architecture;
• Create basic react components to display a series of results;
• Following instructions and looking for answers in documentations.

The server should be able to:

• Create Trello cards through a secured route;
• Listen to Trello webhooks to save created and updated cards into a local database; it should also delete cards whenever receiving the relative event.

The React frontend app should be able to:

• Show the list of the cards saved in the database
• Allow to create a new card

The exercise is to write some code only where the TODO: instructions are:

• ./app/controllers/api/v1/cards_controller.rb: write the endpoint to create cards (see API reference below);
• ./app/controllers/api/v1/webhooks_controller.rb: write the Trello webhook that saves / deletes cards from / to the database;
• ./spec/controllers/api/v1/cards_controller_spec.rb: write the the tests for the controller;
• ./spec/controllers/api/v1/webhooks_controller_spec.rb: write the the tests for the trello webhook;
• ./spec/models/card_spec.rb: write the tests for the card model;
• ./app/models/card.rb: write the methods needed in the model;
• ./app/javascript/packs/components/App.jsx: write the React components (you can also use the components if you want to split into multiple components)

📦 Installing the project

git clone [email protected]:callbellchat/callbell-fullstack-test.git
cd callbell-fullstack-test
yarn install
cp .env.sample .env
bundle install

Alternatively, you can download the source code and unzip it.

Create a Trello account

1. Create a free Trello account if you don't have one already, then visit https://trello.com/app-key to generate credentials.
2. Create a new board Callbell full stack test.
3. Open the board, and append .json into the URL bar to get the board ID (example: https://trello.com/b/W6RusfMK/callbell-fullstack-test.json).
4. Copy the credentials and the board ID into your .env file.

Running the project

You first need to expose your local API so that Trello can send events to your webhooks. For this, run npx ngrok http 3000 to listen to localhost:3000. Keep that terminal open for the whole test.

On another terminal, run your server:

bundle exec rails s

Register your webhook using the following cURL command on a new terminal:

curl -X POST -H "Content-Type: application/json" \
https://api.trello.com/1/tokens/{YOUR_TRELLO_API_TOKEN}/webhooks/ \
-d '{
  "key": "{YOUR_TRELLO_API_KEY}",
  "callbackURL": "https://<YOUR_NGROK_ID>.ngrok.io/api/v1/webhooks",
  "idModel":<YOUR_TRELLO_BOARD_ID>,
  "description": "My first webhook"
}'

Your server will be available at localhost:3000. Changes made to the code should reload automatically.

Important note: if for any reason you have to restart ngrok, the webhooks URL will therefore change, so you'll need to register the webhooks again.

• To run tests: bundle exec rspec.

🧰 API reference

Endpoint	Action	Payload	Response
POST /cards	Create a new card in Trello	{ "name": "My new Trello Card !", "id_list": "5fa106c99173787897d5ff3e", "description": "This is a nice description :).", "due": "2020-12-24", }	See response body { "ok": true, "data": { "id": "5fa264697c310c4623b40eda", // ... } }

In case of parameters error, the server returns a 422 error code. In case of a dependency error, the server returns a 424 error code.

🗒 Additional notes

• You'll find specific information and help where the TODO: instructions are.
• You should not need to add any package to the project, but feel free to use additional deps if needed (both backend and frontend)
• For interacting with Trello API you can either use your own REST service or use a gem. The choice is up to you!

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📪 Once you're done

Send me an email at [email protected] with subject [Full Stack Test], and containing:

• either a link to the GitHub repository of your project (if you want to keep it private, add @proudlygeek as collaborator),
• OR a ZIP WITHOUT the node_modules folder;
• your next availabilities so I can schedule a review call with you.

Thanks for participating, have fun!
Gianluca, CTO at Callbell