How to use composition in Typegraphql

Question

Im using typeorm and typegraphql to build an API and I would like to abstract out properties of an entity into separate files and then import them to clean up the file:

Example of current

@Entity()
@ObjectType()
export class Person extends BaseEntity {
  @Field()
  @Column()
  name: string;

  @Field()
  @Column()
  surname: string;

  @Field()
  @Column()
  age: number;

  @Field()
  @Column()
  email: string;
}

I would like to do something like this:


class Name {
  @Field()
  @Column()
  name: string;

  @Field()
  @Column()
  surname: string;
}
@Entity()
@ObjectType()
export class Person extends BaseEntity {
  @Field()
  @Column()
  age: number;

  @Field()
  @Column()
  email: string;

  // then import the class here 
  ...Name
}

Is there any way to do this without creating separate entities and tables?

Sid · Accepted Answer · 2022-10-28 11:48:11Z

1

Ended up using mixins to solve this because embedded entities doesn't work with both typeorm and typegraphql


export const WithName = <SubClass extends Constructor>(subClass?: SubClass) => {
  @ObjectType({ isAbstract: true })
  @InputType({ isAbstract: true })
  class Mixin extends getFallbackClass(subClass) {
    constructor(...args: any[]) {
      super(...args);
    }
    @Field()
    @Column()
    first: string;

    @Field()
    @Column()
    second: string;

  }

  return Mixin;
};

then using it like:

class Human extends WithName(class {}) {

}

answered Oct 28, 2022 at 11:48

Sid

1,0843 gold badges25 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Charles Semaan · Accepted Answer · 2022-10-19 12:35:19Z

0

This is only possible client side by using fragments https://www.apollographql.com/docs/react/data/fragments/

Perhaps you can use something like type inheritance perhaps by using this library https://github.com/nicolasdao/graphql-s2s

Check out this link for reference.

answered Oct 19, 2022 at 12:35

Charles Semaan

2914 silver badges19 bronze badges

1 Comment

Sid Over a year ago

Ended up using mixins

Collectives™ on Stack Overflow

How to use composition in Typegraphql

2 Answers 2

Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related