以下Ajax请求在做什么错…？

链接/通话：

<%= link_to 'Business Analysis', it_business_analysis_path, :remote => true %>

路线：

match 'it/business_analysis' => 'informationtechnology#business_analysis', :as => :it_business_analysis

控制器：

class InformationtechnologyController < ApplicationController  
  def business_analysis

    render :update do |page|
      page.replace_html 'page_content', :partial => 'business_analysis'
    end

  end
end

风景：

<div id="page_content">
</div>

部分称为：

_business_analysis.html.erb

错误：

Action Controller: Exception caught

<h1>Template is missing</h1>
<p>Missing template informationtechnology/update, application/update with {:formats=&gt;[:js, &quot;application/ecmascript&quot;, &quot;application/x-ecmascript&quot;, :html, :text, :js, :css, :ics, :csv, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json], :handlers=&gt;[:builder, :coffee, :erb], :locale=&gt;[:en, :en]}. Searched in: * &quot;/home/<user_name>/Websites/<project_name>/app/views&quot;

看起来Rails正在寻找一个名为“更新”的视图-为什么以及如何解决此问题？

非常感谢！汤姆