code: public static function findAllActive(array $arrOptions=array())
  	{
  		$t = static::$strTable;
  		$time = Date::floorToMinute();
  
  		return static::findBy(array("$t.disable='' AND ($t.start='' OR $t.start<='$time') AND ($t.stop='' OR $t.stop>'" . ($time + 60) . "')"), null, $arrOptions);
  	}
docs: Find all active groups
  
  @param array $arrOptions An optional options array
  
  @return Collection|MemberGroupModel|null A collection of models or null if there are no member groups