Magento集合加入别名

Question

我想要Mage_Adminhtml_Block_Dashboard_Orders_Grid setCollection重写。

我完成了：

public function setCollection($collection)
{   
    $connection = $collection->getConnection();

    if(!Mage::helper("accountmanager")->isAdmin()){
        $userId = Mage::helper("accountmanager")->getUserId();
        $collection->getSelect()->joinInner(array('items_table'=>'sales_flat_order_item'),
                'main_table.entity_id = items_table.order_id ',
                null);
        $collection->getSelect()->joinInner(array('e'=>'catalog_product_entity'),
                'items_table.product_id = e.entity_id ',
                null);
        $collection->getSelect()->joinLeft(array('at_created_by'=>'catalog_product_entity_int'),
                '(`at_created_by`.`entity_id` = `e`.`entity_id`) AND (`at_created_by`.`attribute_id` = 141) AND (`at_created_by`.`store_id` = 0)  ',
                null);
        $collection->getSelect()->where("at_created_by.value = '".$userId."'");
    }       
    exit($collection->getSelect()); 
    parent::setCollection($collection);         
}

结果如下：

SELECT `main_table`.*, `main_table`.`total_item_count` AS `items_count`, CONCAT_WS(' ', main_table.customer_firstname, main_table.customer_lastname) AS `customer`, `main_table`.`base_grand_total` AS `revenue` FROM `sales_flat_order` AS `main_table` INNER JOIN `sales_flat_order_item` AS `items_table` ON main_table.entity_id = items_table.order_id INNER JOIN `catalog_product_entity` AS `e` ON items_table.product_id = e.entity_id LEFT JOIN `catalog_product_entity_int` AS `at_created_by` ON (`at_created_by`.`entity_id` = `e`.`entity_id`) AND (`at_created_by`.`attribute_id` = 141) AND (`at_created_by`.`store_id` = 0) WHERE (store_id = '1') AND (at_created_by.value = '3')

此sql错误：错误代码：1052。冠军：'store_id'dans where where est ambigu

我认为store_id没有别名'main_table'。

我的查询如何添加别名??

请帮帮我。

想你。