ruby-on-rails-3 – rails如果检查失败然后救援

发布时间：2020-12-17 02:32:51 所属栏目：百科来源：网络整理

导读：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::Re

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 => :show
before_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_path
end

def 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_path
end

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])
  end
rescue ActiveRecord::RecordNotFound
  flash[:alert] = "The user you were looking for could not be found"
  redirect_to root_path
end

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
  end
end

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

（编辑：李大同）

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