public function rules(): array 	{ 		$domain_id = $this->id?->getKey();  		return [ 			'domain' => ['required', 'unique:' . Domain::class . ',domain,' . $domain_id . ',id', 'string', 'max:50'], 			'languages' => ['array', 'required'], 			'languages.*' => ['required', 'string', new Enum(DomainLanguages::class)], 			'main_language' => ['required', 'string', new Enum(DomainLanguages::class), 'in_array:languages.*'], 			'frontend_survey_start_url' => ['required', 'url', 'max:100'], 			'active' => ['boolean'],  		]; 	}