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POHow do i run a subquery as a new attribute in a product collection?
 

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  1. POHow do i run a subquery as a new attribute in a product collection?
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    <p>I want to create a new column for the product grid in the admin that counts the amount of children products related to a configurable product in the products grid in the admin.</p> <p>I came up with sub-query to do the calculations:</p> <pre><code>(SELECT SUM(children_qtys.qty) FROM (SELECT cisi.qty AS qty FROM catalog_product_super_link cpsa LEFT JOIN cataloginventory_stock_item cisi ON cisi.product_id = cpsa.parent_id AND cisi.stock_id=1 WHERE cpsa.parent_id = {{attribute}}) AS children_qtys) </code></pre> <p>I overrode Mage_Adminhtml_Block_Catalog_Product_Grid::_prepareCollection(), and inserted my attribute using the following code:</p> <pre><code> $getChildrenQtySum = '(SELECT SUM(children_qtys.qty) FROM (SELECT cisi.qty AS qty FROM catalog_product_super_link cpsa LEFT JOIN cataloginventory_stock_item cisi ON cisi.product_id = cpsa.parent_id AND cisi.stock_id=1 WHERE cpsa.parent_id = {{attribute}}) AS children_qtys)'; $collection-&gt;addExpressionAttributeToSelect( 'custom_qty', $getChildrenQtySum, 'entity_id' ); </code></pre> <p>The method addExpressionAttributeToSelect() i found in Magento core files, and appears to be able to run raw mysql queries, but when i load the grid page i get a WSOD, and in the log all i get is the query for the products. It looks to me like my sub-query is being wrapped in "`"'s and not using the alias i am specifying (custom_qty).</p> <pre><code>a:5:{i:0;s:747:"SELECT `e`.*, (SELECT SUM(children_qtys.qty) FROM (SELECT cisi.qty AS qty FROM catalog_product_super_link cpsa LEFT JOIN cataloginventory_stock_item cisi ON cisi.product_id = cpsa.parent_id AND cisi.stock_id=1 WHERE cpsa.parent_id = e.entity_id) AS `children_qtys)`, `at_status`.`value` AS `status`, `at_visibility`.`value` AS `visibility` FROM `catalog_product_entity` AS `e` INNER JOIN `catalog_product_entity_int` AS `at_status` ON (`at_status`.`entity_id` = `e`.`entity_id`) AND (`at_status`.`attribute_id` = '96') AND (`at_status`.`store_id` = 0) INNER JOIN `catalog_product_entity_int` AS `at_visibility` ON (`at_visibility`.`entity_id` = `e`.`entity_id`) AND (`at_visibility`.`attribute_id` = '102') AND (`at_visibility`.`store_id` = 0) </code></pre> <p>What am i doing wrong, and is there a better way to do what i want to accomplish?</p>
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