使用关联模型MANY_TO_MANY关联不能获取关联表的字段

[phpcxy]

如果把RelationModel.class.php的180行

原来的：

$sql = "SELECT b.{$mappingFields} FROM {$mappingRelationTable} AS a, ".$model->getTableName()." AS b WHERE a.{$mappingRelationFk} = b.{$model->getPk()} AND a.{$mappingCondition}";

改为：

$sql = "SELECT {$mappingFields} FROM {$mappingRelationTable} AS a, ".$model->getTableName()." AS b WHERE a.{$mappingRelationFk} = b.{$model->getPk()} AND a.{$mappingCondition}";

自己定义$mappingFields来查询那个表那个字段。