What are TypeORM relations and how do I use them?

What are TypeORM relations and how do I use them?

TypeORM relations are used to define relationships between entities in your database. They help in managing how data is connected.

Can you explain the different types of relations available in TypeORM?

Sure! TypeORM supports several types of relations: One-to-One, One-to-Many, Many-to-One, and Many-to-Many.

How do I set up a One-to-Many relationship in TypeORM?

To set up a One-to-Many relationship, you define a property in the 'one' entity that holds an array of the 'many' entity.

Can you provide a code example for that?

Absolutely! Here's a simple example:

@Entity()
export class User {
  @PrimaryGeneratedColumn()
  id: number;

  @OneToMany(() => Post, post => post.user)
  posts: Post[];
}

@Entity()
export class Post {
  @PrimaryGeneratedColumn()
  id: number;

  @ManyToOne(() => User, user => user.posts)
  user: User;
}