Question

我有以下代码段：

oldroompaxinfo = Roompaxinfo.find(:all, :conditions =>["bkgitem_id = ?",bkgitemid])

.... some code to identify which passenger ids have changed

roompaxinfo = Roompaxinfo.find(:first, :conditions => ["bkgitem_id = ? and roomno = ?  and pax_id = ?", bkgitemid, roomno, oldpaxid])

roompaxinfo.pax_id = newpaxid
roompaxinfo.save

..... some code to send the changes to a remote service.

#If errors occur during send I want to re-instate the old info 
if retcode.index('Error') != nil
   oldroompaxinfo.each do |rp|
       rp.save
   end
end

问题是最后一段代码没有保存旧数据。如果某人认为由于条件检查而没有执行，那么我已经通过在flash中输出一些东西来证明它确实存在。我也试过rp.save！但这也没有帮助。

我正在使用MySQL和Ruby 1.8以及Rails 2.3.8

Answer 1

当您点击循环时，Rails认为rp不是“脏”，因此执行保存实际上并不触及数据库。如果属性发生了变化，Rails只会发出update语句。

您可能需要保存所需的旧参数（仅pax_id？），重新加载rp记录，然后尝试保存：

oldroompaxinfo.each do |rp|
  pax_id = rp.pax_id
  rp.reload
  rp.update_attributes(:pax_id => pax_id)
end

Rails数据未保存

1 个答案: