Podcast Backend

Progress

✅ D2: Take a REST

✅ D3: GraphQL > Rest

✅ D4: TypeORM > Fake DB

✅ D9: User Time!

requirements for the user authentication

- Users should be able to login with a password.
- There should be only **one** user entity but your entity should support two roles 'Host' and 'Listener'.
- Create Guards to protect private resolvers.
- Use JWT as authentication method.
- Create a decorator to get the logged in user.

resolvers needing to implement

- createAccount
- login
- editProfile
- seeProfile

✅ D12: Unit Testing!

- podcasts.service.spec.ts
- jwt.service.spec.ts
- users.service.spec.ts

✅ D16: Unit Testing!

• E2E test the users.resolver.ts and podcasts.resolver.ts

✅ D17: Roles!

• New update!: To test Listener role, likePodcast resolver is created
• likePodcast can be called only by user with Listener role
• likePodcast will like the podcast if never been liked, otherwise dislike

✅ D18-The Last Resolvers

Protected by Listener Role

Create new resolver

podcast.resolver.ts

searchPodcasts (by title)

reviewPodcast

• Created podcastRating entity with rating column as N:M mapper
• After updating podcastRating, get average and update rating of the podcast

user.resolver.ts

subscribeToPodcast

seeSubscriptions

markEpisodeAsPlayed (like a Netflix movie that has been watched)

✅ D19-Deploy!

• heroku doesn't support sqlite => if production, use postgres
• if production, default value of playground is false => manually set true

// app.module.ts
playground: true,
introspection: true,

---

Note

Installation

npm i bcrypt @types/bcrypt --dev-only
npm i --save @nestjs/config
npm i cross-env
touch .env.dev .env.prod .env.test
echo .env.dev >> .gitignore
npm i joi
nest g mo auth

D4: TypeORM > Fake DB => nested relation

const episodes = await this.episodes.find({
  podcast: { id: podcastId },
});

D18-The Last Resolvers

• QueryBuilder sample

const subscribedUser = await this.users
  .createQueryBuilder('user')
  .innerJoin(
    'user_subscribed_podcasts_podcast',
    'subscribedPodcast',
    'user.id = :userId',
    { userId },
  )
  .andWhere('subscribedPodcast.podcastId = :podcastId', { podcastId })
  .getOne();

• To Handle drop constraint error, set onDelete: 'cascade' at ManyToOne