Rails after_save 回调未触发
Posted
技术标签:
【中文标题】Rails after_save 回调未触发【英文标题】:Rails after_save callback not firing 【发布时间】:2014-12-23 23:15:52 【问题描述】:我有下面的代码可以很好地删除记录,但是在尝试使用 after_save 回调将记录插入表中时,什么都不做。
本质上,我正在做的是创建一系列高级关系,这些关系应该在campaign_category_metro_bids 表中创建或删除关系。如果我在 phpMyAdmin 中运行就没有问题。但是在rails中点击并激活只允许调用第二个回调,after_destroy......
class CampaignMetro < ActiveRecord::Base
belongs_to :campaign
belongs_to :metro
after_destroy :destroy_category_campaign_metro_bid
after_save :create_category_campaign_metro_bid
def create_category_campaign_metro_bid
insert = "INSERT INTO campaign_category_metro_bids (campaign_id,category_id, metro_id, created_at, updated_at)
SELECT e.campaign_id, e.category_id, e.metro_id, NOW(), NOW()
FROM
(SELECT c.campaign_id, c.category_id, c.metro_id
FROM (SELECT a.campaign_id, a.category_id, b.metro_id
FROM campaign_categories a
cross join campaign_metros b
ON a.campaign_id = b.campaign_id) c) e
LEFT JOIN campaign_category_metro_bids d
ON d.campaign_id = e.campaign_id and
d.category_id = e.category_id and
d.metro_id = e.metro_id
WHERE d.campaign_id is null and
d.category_id is null and
d.metro_id is null;"
ActiveRecord::Base.connection.execute(insert)
end
def destroy_category_campaign_metro_bid
delete="DELETE d.*
FROM campaign_category_metro_bids d
LEFT JOIN
(SELECT c.campaign_id, c.category_id, c.metro_id
FROM (SELECT a.campaign_id, a.category_id, b.metro_id
FROM campaign_categories a
cross join campaign_metros b
ON a.campaign_id = b.campaign_id) c) e
ON d.campaign_id = e.campaign_id and
d.category_id = e.category_id and
d.metro_id = e.metro_id
WHERE e.campaign_id is null and
e.category_id is null and
e.metro_id is null;"
ActiveRecord::Base.connection.execute(delete)
end
end
我怎样才能让它工作?
【问题讨论】:
【参考方案1】:问题是在after_save
上,将在数据库上创建记录的事务尚未提交,因此记录还没有真正存在。你必须使用after_commit
。
http://apidock.com/rails/ActiveRecord/Transactions/ClassMethods/after_commit
【讨论】:
我试过了,没用。我在通过 SQL 调用创建的表上使用回调,而不是活动记录 你能在保存/提交回调后得到任何在那个模型中运行吗?如果这是通过在广告系列中添加 Metro 来隐式创建的,反之亦然,那么这就是问题所在,我们可以探索解决方案 我将整个过程移到了一个正在使用活动记录创建的模型中,并且它完全按照应有的方式运行。没问题 这些型号和has_and_belongs_to_many
有关系吗?如果是这样,那么您可以尝试使用has_many :through
guides.rubyonrails.org/…以上是关于Rails after_save 回调未触发的主要内容,如果未能解决你的问题,请参考以下文章
Rails ActiveRecord 在 after_save 回调中使用最近保存的记录 ID [关闭]