metropolis/src/items/items.model.ts

import { Field, ID, ObjectType } from '@nestjs/graphql';

@ObjectType('Item', {
  description: 'Either the inventored thing or a box containing them',
})
export class ItemModel {
  @Field((type) => ID)
  id: string;

  @Field()
  name: string;

  @Field({ nullable: true })
  notes?: string;

  @Field({ nullable: true })
  parent?: ItemModel;

  @Field((type) => [ItemModel])
  children: ItemModel[];

  @Field((type) => [ItemModel], { deprecationReason: 'typeorm issues' })
  descendents: ItemModel[];
}