What are TypeORM relations and how do they work?

What are TypeORM relations and how do they work?

TypeORM relations are used to define how entities relate to each other in a database. They help in managing data relationships like one-to-one, one-to-many, and many-to-many.

Can you explain the different types of relations in TypeORM?

Sure! The main types of relations in TypeORM are: 1. One-to-One: A single entity is related to another single entity. 2. One-to-Many: A single entity can relate to multiple entities. 3. Many-to-One: Multiple entities can relate to a single entity. 4. Many-to-Many: Multiple entities can relate to multiple entities.

How do I implement a one-to-many relation in TypeORM?

To implement a one-to-many relation, you define the relation in both entities using the @OneToMany and @ManyToOne decorators. For example, in a User entity, you can have a posts property that uses @OneToMany to relate to a Post entity.

What are some common pitfalls when working with TypeORM relations?

Common pitfalls include forgetting to set up the inverse side of the relation, not using the correct cascade options, and failing to manage loading strategies properly.