/** * Defined by Zend_Validate_Interface * * Returns true if and only if $value does exist already as group name * * @param string $value * @return boolean */ public function isValid($value) { $value = (string) $value; $this->_setValue($value); $mdlGroup = new Model_Group(); if ($mdlGroup->groupExists($value, $this->getExclude())) { return true; } $this->_error(self::NOT_EXISTS); return false; }