> */ public function rules(): array { return [ // ID of the member to which the data should be transferred (destination) 'member_id' => [ 'string', ExistsEloquent::make(Member::class, null, function (Builder $builder): Builder { /** @var Builder $builder */ return $builder->whereBelongsTo($this->organization, 'organization'); })->uuid(), ], ]; } public function getMemberId(): string { return (string) $this->input('member_id'); } }