model-with-subcollection.ts

import { Collection, SubCollection, ISubCollection } from 'fireorm';

class Album {
  id: string;
  name: string;
  year: number;
}

@Collection()
export class Band {
  id: string;
  name: string;
  formationYear: number;
  genres: Array<string>;
  @SubCollection(Album)
  albums?: ISubCollection<Album>;
}