protected static function retrieve_record_set($params) {
        $cache = cache::make('core', 'grade_categories');
        return $cache->get(self::generate_record_set_key($params));
    }
protected static function retrieve_record_set($params) {
        $cache = cache::make('core', 'grade_categories');
        return $cache->get(self::generate_record_set_key($params));
    }
protected static function retrieve_record_set ( $ params ) { $ cache = cache :: make ( 'core' , 'grade_categories' ) ; return $ cache -> get ( self :: generate_record_set_key ( $ params ) ) ; }
Tries to retrieve a record set from the cache.

@param array $params The query params
@return grade_object[]|bool An array of grade_objects or false if not found.
Tries to retrieve a record set from the cache .