在Rails中使用救援工作

Question

我正在使用以下作品;

def index
  @user = User.find(params[:id]) 
  rescue
    flash[:notice] = "ERROR"
    redirect_to(:action => 'index')
  else 
    flash[:notice] = "OK"
    redirect_to(:action => 'index')
end

现在我要么是否有正确的ID,我总是在我看来"OK",我做错了什么？

我需要在DB中没有ID时显示"ERROR".我也试过使用,rescue ActiveRecord::RecordNotFound但同样的事情发生了.

所有帮助表示赞赏.

Answer 1

仅当救援块中没有返回时,才解释救援块结束后的所有代码.所以你可以在救援区结束时给退货打电话.

def index
  begin
    @user = User.find(params[:id]) 
  rescue
    flash[:notice] = "ERROR"
    redirect_to(:action => 'index')
    return
  end
  flash[:notice] = "OK"
  redirect_to(:action => 'index')
end

要么

def index
  @user = User.find(params[:id]) 
  # after is interpret only if no exception before
  flash[:notice] = "OK"
  redirect_to(:action => 'index')
rescue
  flash[:notice] = "ERROR"
  redirect_to(:action => 'index')
end

但在你的情况下,更好的是使用rescue_from或rescue_in_public

喜欢

class UserController < ApplicationController
  def rescue_in_public(exception)
    flash[:notice] = "ERROR"
    redirect_to(:action => 'index')
  end

  def index
    @user = User.find(params[:id]) 
    flash[:notice] = "OK"
    redirect_to(:action => 'index')
  end
end

但是使用rescue_in_public并不是一个好建议

Answer 2

只是 Rails Rescue 的总体答案：

我发现这非常酷：

@user = User.find(params[:id])  rescue ""