ruby-on-rails - Rails 3中的动态错误页面

Question

在Rails 2.3.x中，您可以像这样覆盖render_optional_error_file:

# ApplicationController.rb
protected
  def render_optional_error_file(status_code)
    render :template => "errors/500", :status => 500, :layout => 'application'
  end

但是，Rails 3不再具有render_optional_error_file。相反，您需要重写rescue_action_in_public，您可以这样做:

# config/initializers/error_page.rb
module ActionDispatch
  class ShowExceptions

    protected    
      def rescue_action_in_public(exception)
        status = status_code(exception).to_s

        template = ActionView::Base.new(["#{Rails.root}/app/views"])
        if ["404"].include?(status)
          file = "/errors/404.html.erb"
        else
          file = "/errors/500.html.erb"
        end        
        body = template.render(:file => file)

        render(status, body)
      end

  end
end

这可行，但不使用应用程序的布局。但是，如果您这样指定布局路径:

body = template.render(:file => file, :layout => "layouts/application") # line 15

您会收到一个Error during failsafe response: ActionView::Template::Error。

application.html.erb:4的第4行是:

<%= stylesheet_link_tag "app", "jquery-ui", "jquery.fancybox", :cache => "all" %>

ActionView通常用于呈现模板的任何内容都不会加载。

堆栈跟踪为:

  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:794:in `join'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:794:in `rails_asset_id'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:817:in `rewrite_asset_path'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:746:in `compute_public_path'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:424:in `path_to_stylesheet'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:875:in `ensure_stylesheet_sources!'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:874:in `each'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:874:in `ensure_stylesheet_sources!'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/helpers/asset_tag_helper.rb:512:in `stylesheet_link_tag'
  /data/sites/fundraisers-stage/releases/20110316194843/app/views/layouts/application.html.erb:4:in `_app_views_layouts_application_html_erb___19482063_70294907435920_0'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/template.rb:135:in `send'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/template.rb:135:in `render'
  /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/notifications.rb:54:in `instrument'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/template.rb:127:in `render'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/render/layouts.rb:80:in `_render_layout'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/render/rendering.rb:62:in `_render_template'
  /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/notifications.rb:52:in `instrument'
  /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
  /var/lib/gems/1.8/gems/activesupport-3.0.5/lib/active_support/notifications.rb:52:in `instrument'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/render/rendering.rb:56:in `_render_template'
  /var/lib/gems/1.8/gems/actionpack-3.0.5/lib/action_view/render/rendering.rb:26:in `render'
  /data/sites/fundraisers-stage/releases/20110316194843/config/initializers/error_pages.rb:15:in `rescue_action_in_public'

Answer 1

在rails 3.2中，它比这更容易:

将此添加到config/application.rb:

config.exceptions_app = self.routes

这导致错误通过路由器进行路由。然后，您只需添加到config/routes.rb:

match "/404", :to => "errors#not_found"

我从JoséValim的博客文章“My five favorite hidden features in Rails 3.2”中的项目3中获得了此信息。