通过Ajax加载模板 - 错误

Question

我有这种形式，我想通过AJAX加载到视频节目的看法：

<%= form_for @video, :url => {:action => "update"}, :remote => true do |f| %> 
    <div class="field"> 
    <%= f.text_field :topic_names, :class => "topic_field" %> 
    </div> 
    <%= f.submit "Add Topic" %> 
<% end %> 

我在视频节目鉴于这种链接，单击时，我想它呈现形式：

<%= link_to "Add Topics", new_topicable_path(@topicable, :format => :js), :remote => true, :id => 'edit_topics_link' %> 

我把形式topicables/new.html.erb和我有topicables/new.js.erb文件，其中有：

$("<%= escape_javascript render(:file => 'topicables/new.html.erb') %>").insertAfter('.topic_holder'); 
$('#edit_topics_link').hide(); 

现在，当我单击链接时，我的日志中出现错误。这是我的日志显示：

Started GET "/topicables/new.js" for 127.0.0.1 at Sat Apr 02 03:58:52 -0700 2011 
Processing by TopicablesController#new as JS 
Rendered topicables/new.html.erb (0.7ms) 
Rendered topicables/new.js.erb (2.6ms) 
Completed in 15ms 

ActionView::Template::Error (undefined method `model_name' for NilClass:Class): 
    1: <%= form_for @video, :url => {:action => "update"}, :remote => true do |f| %> 
    2: <div class="field"> 
    3: <%= f.text_field :topic_names, :class => "topic_field" %> 
    4: </div> 
    app/views/topicables/new.html.erb:1:in `_app_views_topicables_new_html_erb___1876131309_2172772700_0' 
    app/views/topicables/new.js.erb:1:in `_app_views_topicables_new_js_erb__1367015167_2172792200_0' 

Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.4/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms) 
Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.4/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (92.5ms) 
Rendered /Library/Ruby/Gems/1.8/gems/actionpack-3.0.4/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (98.9ms) 

这是怎么回事？我怎样才能解决这个错误，使表单的AJAX渲染工作？

Answer 1

这基本上告诉你@video没有定义。如果是这种情况，您可以在新方法中定义它，或者使用:video创建一个新的实例变量，而不是在页面上下文中查找一个。然后，您可以处理更新方法中的查找和更新。

编辑：jQuery的负载方法

$("#myButton").click(function(){ 
    $("#target").load("/topicables/new #new_topicable"); 
});