Question

我发现ActiveRecord delete_all 忽略了联接表条件。这是Rails社区的已知问题吗？

查询：

DesignPartCategory.joins(:category).where(category: {site_id: INDIA}, designpart_uuid: ['123C']).delete_all

预期结果：

从designpart_category的{{1}}。designpart_category IN（'123C'）和designpart_uuid。designpart_category IN（印度）删除

实际结果：

category_id

当前 delete_all 操作只是忽略/丢弃联接表条件并执行其余查询。

我假设情况并非如此，应该抛出异常而不是忽略联接。请让我们知道您对此的想法/评论。

Answer 1

似乎您的语法中有一些错别字，请检查一下-

DesignPartCategory.joins(:category).where("categories.site_id = ? AND categories.designpart_uuid IN (?)", 'INDIA', ['123C']).delete_all

或者，您可以尝试以下操作：-

DesignPartCategory.joins(:category).where(categories: {site_id: 'INDIA', designpart_uuid: (['123C'])}).delete_all

注意：-Delete vs Destroy

Answer 2

您是否在查询中检查了以下内容？

 DELETE FROM `designpart_category` 
  WHERE `designpart_category`.`designpart_uuid` IN (
    SELECT designpart_uuid FROM (
      SELECT `designpart_category`.`designpart_uuid` 
      FROM `designpart_category` INNER JOIN `category` 
      ON `category`.`category_id` = `designpart_category`.`category_id` 
      WHERE (category.site_id =INDIA AND designpart_category.designpart_uuid in ('123C')
    )
  ) __active_record_temp
);

它会根据您的联接查询进行过滤，检查在IN中触发的查询

Answer 3

delete_all删除匹配条件的记录，而无需先实例化记录，因此不调用destroy方法或调用回调。因此，它不会考虑任何join，includes等问题。 Check the documentation

delete_all是否会忽略基于联接表的条件？

3 个答案: