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<?php namespace App\Rules; use Closure; use Illuminate\Contracts\Validation\ValidationRule; class RelationNotExist implements ValidationRule { public $class; public $relation; /** * Create a new rule instance. * * @return void */ public function __construct(?string $class = null, ?string $relation = null) { $this->class = $class; $this->relation = $relation; } /** * Run the validation rule. */ public function validate(string $attribute, mixed $value, Closure $fail): void { $relation = $this->relation; if ($this->class::find($value)->$relation()->exists()) { $fail("Relation {$this->relation} exists."); } } }