#3355: filter() with related table stomps on extra(tables) ------------------------------------------------+--------------------------- Reporter: Rob Hudson <[EMAIL PROTECTED]> | Owner: adrian Status: new | Component: Database wrapper Version: SVN | Keywords: Stage: Unreviewed | Has_patch: 0 ------------------------------------------------+--------------------------- I started a discussion here with no responses so I thought I'd file a bug so this doesn't get lost... http://groups.google.com/group/django- developers/browse_thread/thread/a88046d26172908d/?hl=en# Summary: If you're using extra() to specify extra tables to add to your query AND you're using filter() with a related table, the extra() table gets lost. Example (also found in the above message): This correctly adds "page_item" to the FROM clause by using extra(). Notice I'm not yet referencing a related table in the filter() clause since template_id is contained in the Page object. {{{ In [29]: Page.objects.extra( tables=['page_item'], where=['page_item.page_id=page_page.id']) .filter(template__id='1')._get_sql_clause() Out[29]: (['`page_page`.`id`', '`page_page`.`number`', '`page_page`.`title`', '`page_page`.`template_id`', '`page_page`.`description`'], ' FROM `page_page` , `page_item` WHERE page_item.page_id=page_page.id AND (`page_page`.`template_id` = %s)', ['1']) }}} But adding the related table lookup for the 'name' column in the filter() clause breaks the extra() tables and "page_item" disappears... {{{ In [30]: Page.objects.extra( tables=['page_item'], where=['page_item.page_id=page_page.id']) .filter(template__name='Default Template') ._get_sql_clause() Out[30]: (['`page_page`.`id`', '`page_page`.`number`', '`page_page`.`title`', '`page_page`.`template_id`', '`page_page`.`description`'], ' FROM `page_page` INNER JOIN `page_template` AS `page_page__template` ON `page_page`.`template_id` = `page_page__template`.`id` , `page_item` WHERE page_item.page_id=page_page.id AND (`page_page__template`.`name` = %s)', ['Default Template']) }}}
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