> */ public function rules(): array { return [ 'user_id' => [ 'required', 'uuid', new ExistsEloquent(User::class, null, function (Builder $builder): Builder { /** @var Builder $builder */ return $builder->belongsToOrganization($this->organization); }), ], 'billable_rate' => [ 'nullable', 'integer', 'min:0', ], ]; } }