App\Http\Requests\Back\BackUserRequest::getEmailValidationRule PHP Method

    public function getEmailValidationRule() : string
    {
        $uniqueRule = Rule::unique('users_back', 'email');
        if ($this->method() === 'PATCH') {
            $userId = $this->getRouteParameter('administrator');
            $uniqueRule = $uniqueRule->ignore($userId);
        }
        return "required|email|{$uniqueRule}";
    }