Ruby on Rails

Why is Rails looking for a template while I have told it to render a specific file? This worked under Rails 2. I read http://www.engineyard.com/blog/2010/render-options-in-rails-3/ which from I gather makes any format.xxx look for a template xxx which is *not* what I need to do as the file is created dynamically:

In my controller:

    pdf_file_path = "./directory/file_name.pdf"  # just an example, assume this file exists
    respond_to do |format|
      format.pdf { render :file => pdf_file_path }
   end

But I get:

ActionView::MissingTemplate (Missing template comparisons/display with {:handlers=>[:erb, :rjs, :builder, :rhtml, :rxml], :formats=>[:pdf], :locale=>[:en, :en]} in view paths "/Users/DK/Documents/ror/projects/creditcompare3/app/views"):

Is there a way / better way to do this?
 

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