错误时不重定向到页面

Question

成功后，表单远程提交并正确加载 index.js.erb（生活很好）

但是在错误（其他）时没有任何反应。我想要做的是，在出错时加载不同的文件或向 index.js.erb 添加逻辑。但是，它只是失败并且无法加载。

错误 加载资源失败：服务器响应状态为 500（内部服务器错误）我知道在实施救援后收到 406 错误

（我知道这是因为它没有找到事件，但我如何确保它加载我的 index.js.erb- 所以我可以依次显示通知用户的模式）

事件控制器

def index
  respond_to do |format|
    if @event = Event.find_by_event_code(params[:checkin])
      format.html { redirect_to @event, success: "You have found your event" }
      format.js
    elsif @event = Event.find_by_speaker_code(params[:checkin])
      format.html { redirect_to @event, success: "Welcome Super User. You have found your event" }
      format.js
    else
      format.html { redirect_to @event, error: "No event by that event code" }
      format.js
    end
  end
end

index.js.erb

$("#checkin-popup").remove();
$("#checkin-confirm-popup").html("<%= escape_javascript(render("/events/index.html.erb")) %>")
$('#checkin-confirm-popup').modal('show');

button.html

<%= simple_form_for @event, remote: true ,:method => 'get' do |e| %>
    <div class="talknumber"><%= text_field_tag :checkin, params[:search] %></div>
  <%= e.button :submit, "Checkin", :class => "btn btn-default" %>
<% end %>

服务器日志

Started GET "/events?utf8=%E2%9C%93&checkin=1212122&commit=Checkin" for 127.0.0.1 at 2014-01-10 11:43:39 -0500
Processing by EventsController#index as JS
  Parameters: {"utf8"=>"✓", "checkin"=>"1212122", "commit"=>"Checkin"}
   (0.5ms)  SELECT "users"."name" FROM "users"
  Event Load (0.5ms)  SELECT "events".* FROM "events" WHERE "events"."event_code" = 1212122 ORDER BY events.created_at ASC LIMIT 1
  Event Load (0.4ms)  SELECT "events".* FROM "events" WHERE "events"."speaker_code" = 1212122 ORDER BY events.created_at ASC LIMIT 1
Completed 406 Not Acceptable in 7ms (ActiveRecord: 1.4ms)

Answer 1

尝试开始救援块

  def index
    respond_to do |format|
      begin
        if @event = Event.find_by_event_code(params[:checkin])
          format.html { redirect_to @event, success: "You have found your event" }
          format.js
        elsif @event = Event.find_by_speaker_code(params[:checkin])
          format.html { redirect_to @event, success: "Welcome Super User. You have found your event" }
          format.js
        end
      rescue
        format.html { redirect_to @event, error: "No event by that event code" }
        format.js
      end
    end
  end

Answer 2

如果您的视图中有引用 @event 的调用，那么您需要处理它们。如果在页面上你有（比如说）一个提交值的表单，那么只需确保视图提供了@event = Event.new 就足够了。但是，可能情况并非如此，因此如果@event 未定义，您希望通过提供在页面上下文中有意义的替代值来挽救视图阶段。类似的东西：

<%= @event ? @event : 'No event' %>

而不仅仅是

<%= @event %>

编辑：新控制器代码

def index
 respond_to do |format|
    if @event = Event.find_by_event_code(params[:checkin])
      format.html { redirect_to @event, success: "You have found your event" }
      format.js
    else 
      if @event = Event.find_by_speaker_code(params[:checkin])
        format.html { redirect_to @event, success: "Welcome Super User. You have found your event" }
        format.js
      else
        format.html { redirect_to @event, error: "No event by that event code" }
        format.js
      end
    end
  end
end

我真的不认为这是一种很好的做事方式。表单应该是分开的，这样你就可以获得可以查询的单独参数，指定如果（比如）params.has_key? :foo 然后做某事，反之亦然。

<%= simple_form_for @event, remote: true ,:method => 'get' do |e| %>
  <div class="talknumber">
    <%= text_field_tag :event_code, params[:search] %>
    <%= text_field_tag :speaker_code, 'value here - I don't know what params[:search is] %>
  </div>
  <%= e.button :submit, "Checkin", :class => "btn btn-default" %>
<% end %> 

这样你可以说如果params.has_key? :event_code 是假的，那么寻找params.has_key? :speaker_code，如果失败了，执行else 分支。