ruby-on-rails-3 – rails如果检查失败然后救援

概述我的控制器中有2个方法用于查找用户(请注意enabled_only范围)： before_filter :find_user, :only => :showbefore_filter :find_any_user, :only => [:edit, :update, :destroy]def find_user @user = User.enabled_only.find(params[ 我的控制器中有2个方法用于查找用户(请注意enabled_only范围)：

before_filter :find_user,:only => :showbefore_filter :find_any_user,:only => [:edit,:update,:destroy]def find_user  @user = User.enabled_only.find(params[:ID])rescue ActiveRecord::RecordNotFound  flash[:alert] = "The user you were looking for Could not be found"  redirect_to root_pathenddef find_any_user  @user = User.find(params[:ID])rescue ActiveRecord::RecordNotFound  flash[:alert] = "The user you were looking for Could not be found"  redirect_to root_pathend

当然,这些可以合并为一种方法,检查是否：action ==’show’但是我无法得到救援来捕获错误.我试过类似下面的东西,但它不起作用：

before_filter :find_user,:only => [:show,:edit,:destroy]def find_user  @user = if :action == 'show'    User.enabled_only.find(params[:ID])  else    User.find(params[:ID])  endrescue ActiveRecord::RecordNotFound  flash[:alert] = "The user you were looking for Could not be found"  redirect_to root_pathend

请告知如何做到这一点.

谢谢

解决方法 您需要在开始和救援之间包装您想要“保护”的代码

before_filter :find_user,:destroy]def find_user  begin    @user = if :action == 'show'      User.enabled_only.find(params[:ID])    else      User.find(params[:ID])    end  rescue ActiveRecord::RecordNotFound    flash[:alert] = "The user you were looking for Could not be found"    redirect_to root_path  endend

顺便提一下你的测试：action ==’show’永远不会成真. ：action是一个符号,其值是：action,它的值永远不会改变,同样对于’show’,它的值永远不会改变.我不确定实现这个目标的最佳方法是什么,但是你可以做但如果params [：action] ==“show”你可以做到

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