NestJS Jumpstart

Description

The Problem:
The company wants to implement a customer referral program, in order to acquire new paying customers. Here are the product requirements that we are given:
```● An existing user can create a referral to invite people, via a shareable sign-up link that contains a unique code
● When 5 people sign up using that referral, the inviter gets $10.
● When somebody signs up referencing a referral, that person gets $10 on signup.
Signups that do not reference referrals do not get any credit.
● Multiple inviters may invite the same person. Only one inviter can earn credit for a
particular user signup. An inviter only gets credit when somebody they invited signs up; they do not get credit if they invite somebody who already has an account.

Use cases:
```● Alice, an existing user, creates a referral. She gets a link that has a unique code in it.
She emails that link to 5 of her friends.
● Bob, one of Alice’s friends, clicks on the link. He goes through the signup process to
create a new account. Once he has created his account, he sees that he has $10 in
credit.
● Four more people follow the same process as Bob, clicking on the link Alice sent them.
They all get $10 in credit. Once the fifth person has signed up, Alice sees that she has
$10 in credit.
● Jeffrey signs up using a link that does not contain a unique referral code. After he
creates a new account, he has $0 in credit.

You can check live swagger ui here: (https://nestjs-referral-staging.herokuapp.com/api)

Installation

$ yarn install

Database configuration

Install postgres latest version. Copy .env.example -> .env and config database variables.

$ yarn migration:run

Running the app

# development
$ yarn start
# watch mode
$ yarn start:dev
# production mode
$ yarn start:prod

Open browser and visit localhost:8080/api.

Test

# unit tests
$ yarn test
# e2e tests
$ yarn test:e2e
# test coverage
$ yarn test:cov