#HasOneRepository

const User = db.collection({
  name: 'users',
  fields: [
    { type: 'hasOne', name: 'profile' },
    { type: 'string', name: 'name' },
  ],
});

const Profile = db.collection({
  name: 'profiles',
  fields: [{ type: 'string', name: 'avatar' }],
});

const user = await User.repository.create({
  values: { name: 'u1' },
});

// 获取到关联 Repository
const userProfileRepository = User.repository
  .relation('profile')
  .of(user.get('id'));

// 也可直接初始化
new HasOneRepository(User, 'profile', user.get('id'));

interface SingleRelationFindOption extends Transactionable {
  fields?: Fields;
  except?: Except;
  appends?: Appends;
  filter?: Filter;
}

const profile = await UserProfileRepository.find();
// 关联对象不存在时，返回 null

const profile = await UserProfileRepository.create({
  values: { avatar: 'avatar1' },
});

console.log(profile.toJSON());
/*
{
  id: 1,
  avatar: 'avatar1',
  userId: 1,
  updatedAt: 2022-09-24T13:59:40.025Z,
  createdAt: 2022-09-24T13:59:40.025Z
}
*/

const profile = await UserProfileRepository.update({
  values: { avatar: 'avatar2' },
});

profile.get('avatar'); // 'avatar2'

await UserProfileRepository.remove();
(await UserProfileRepository.find()) == null; // true

(await Profile.repository.count()) === 1; // true

await UserProfileRepository.destroy();
(await UserProfileRepository.find()) == null; // true
(await Profile.repository.count()) === 0; // true

interface SetOption extends Transactionable {
  tk?: TargetKey;
}

const newProfile = await Profile.repository.create({
  values: { avatar: 'avatar2' },
});

await UserProfileRepository.set(newProfile.get('id'));

(await UserProfileRepository.find()).get('id') === newProfile.get('id'); // true