protected function _extractPrefixedFieldsAsActiveRecords($record)
 {
     foreach ($this->join_relations as $relation_name => $params) {
         $relation_info = $this->base_object->getRelationInfo($relation_name);
         if (isset($relation_info['can_be_null']) && $relation_info['can_be_null'] && !$record->get($this->prefix . $relation_info['field'])) {
             return;
         }
         $fields = new lmbSet();
         $prefix = $this->prefix . $relation_name . '__';
         if ($record instanceof lmbActiveRecord) {
             $data = $record->exportRaw();
         } else {
             $data = $record->export();
         }
         foreach ($data as $field => $value) {
             if (strpos($field, $prefix) === 0) {
                 $non_prefixes_field_name = substr($field, strlen($prefix));
                 $fields->set($non_prefixes_field_name, $value);
                 $record->remove($field);
             }
         }
         $related_object = lmbARRecordSetDecorator::createObjectFromRecord($fields, $relation_info['class'], $this->conn);
         $record->set($this->prefix . $relation_name, $related_object);
     }
 }
 function testIfRecordIsEmpty()
 {
     $iterator = new lmbARRecordSetDecorator(new lmbCollection(), 'LectureForTest');
     $iterator->rewind();
     $this->assertFalse($iterator->valid());
 }