my-links/app/models/collection.ts

import AppBaseModel from '#models/app_base_model';
import Link from '#models/link';
import User from '#models/user';
import { belongsTo, column, hasMany } from '@adonisjs/lucid/orm';
import type { BelongsTo, HasMany } from '@adonisjs/lucid/types/relations';
import { Visibility } from '../enums/visibility.js';

export default class Collection extends AppBaseModel {
  @column()
  declare name: string;

  @column()
  declare description: string | null;

  @column()
  declare visibility: Visibility;

  @column()
  declare next_id: number;

  @column()
  declare authorId: number;

  @belongsTo(() => User, { foreignKey: 'authorId' })
  declare author: BelongsTo<typeof User>;

  @hasMany(() => Link)
  declare links: HasMany<typeof Link>;
}