“删除”动作发生两次？答案

【问题标题】：'Delete' action occurring twice?“删除”动作发生两次？
【发布时间】：2011-07-05 03:27:56
【问题描述】：

我的文件控制器的删除操作有一个奇怪的情况。

Started GET "/files/35/delete" for 127.0.0.1 at 2011-02-27 01:13:51 -0500
Processing by FilesController#delete as HTML
Parameters: {"id"=>"35"}
SQL (0.3ms)  DELETE FROM `files` WHERE (`files`.`id` = 35)
SQL (0.7ms)  COMMIT
Redirected to http://localhost:3000/files
Completed 302 Found in 713ms

Started GET "/files/35/delete" for 127.0.0.1 at 2011-02-27 01:13:52 -0500
Processing by FilesController#delete as HTML
Parameters: {"id"=>"35"}
...leads to error

控制器动作：

@file = @company.files.where("id = ?", params[:id]).first
@file.destroy
flash[:notice] = "Your file was deleted successfully."
redirect_to files_url

路线：

resources :files do
  member do
    get 'delete_ask'
    get 'delete'
  end
end

你知道为什么会这样吗？

【问题讨论】：

标签： ruby-on-rails model-view-controller ruby-on-rails-3 controller routes

【解决方案1】：

我怀疑这是由于重复提交请求而发生的。尝试在客户端通过 javascript 或在服务器端防止双重提交（这将需要比客户端更多的努力，但更健壮）。

【讨论】：

【解决方案2】：

@file = @company.files.where("id = ?", params[:id]).first
if @file
    @file.destroy
    flash[:notice] = "Your file was deleted successfully."
else
    #file was deleted
    flash[:notice] = "Patience: you only need to press delete once" 
end
redirect_to files_url

您可以从错误中rescue：

@file = @company.files.where("id = ?", params[:id]).first
    @file.destroy
    flash[:notice] = "Your file was deleted successfully.
#rescue from error
rescue 
    flash[:notice] = "Patience: you only need to press delete once" 
    redirect_to files_url

【讨论】：