Magento:在网格中加入左表

Question

我正在尝试添加一个网格,我需要在其中进行左连接.

protected function _prepareCollection()
{
    $collection = Mage::getResourceModel('admin/user_collection')->join("school/school",'ref_id = referer_id',"school_name",**"left"**);
    var_dump((string)$collection->getSelect());

    $this->setCollection($collection);
    return parent::_prepareCollection();
}

即使我在看到转储时已经定义了"left",它显示:

SELECT main_table.*, school/school. school_nameFROM admin_userAS main_tableINNER JOIN schoolAS school/schoolON REF_ID = referer_id

我试图做一个 $collection = Mage::getResourceModel('admin/user_collection')->**joinLeft**("school/school",'ref_id = referer_id',"school_name","left");
但我的系统没有向我显示任何var_dump挂起.

Answer 1

尝试getSelect()之前join