使用find_by_id在RSpec中获取不存在的记录时会引发RecordNotFound

Question

我在products_controller_spec.rb中编写了这个规范,用于在不存在的记录上调用destroy时测试重定向:

it "deleting a non-existent product should redirect to the user's profile page with a flash error" do           
    delete :destroy, {:id => 9999}
    response.should redirect_to "/profile"
    flash[:error].should == I18n.t(:slideshow_was_not_deleted)
end

这是products_controller.rb中的控制器操作:

def destroy
  product = Product.find_by_id(params[:id])
  redirect_to "profile" if !product
  if product.destroy
    flash[:notice] = t(:slideshow_was_deleted)
    if current_user.admin? and product.user != current_user
      redirect_to :products, :notice => t(:slideshow_was_deleted)
    else
      redirect_to "/profile"
    end
  else
    if current_user.admin?
      redirect_to :products, :error => t(:slideshow_was_not_deleted)
    else
      redirect_to "/profile"
    end
  end
end

现在,我没想到规格第一次通过,但我不明白为什么它失败了:

Failure/Error: delete :destroy, {:id => 9999}
 ActiveRecord::RecordNotFound:
   Couldn't find Product with id=9999

我的印象是#find_by_id不会在不存在的记录上返回RecordNotFound错误.那我为什么要一个呢？提前致谢!

Answer 1

CanCan抛出了RecordNotFound错误.它不能在控制器动作中拯救(可能是在动作运行之前发生).有两种方法可以解决它 -

1. 将规格更改为:

   it "deleting a non-existent product should result in a RecordNotFound Error" do         
     product_id = 9999
     expect { delete :destroy, {:id => product_id}}.to raise_error ActiveRecord::RecordNotFound
   end
   

或者,2.修补CanCan 就像这样.

我不喜欢修补路线,所以我去了选项1.