/**
* 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;
}
