----------index.html
<h1>Listing topics</h1>

<table>
  <tr>
    <th>Name</th>
    <th>Title</th>
    <th>Content</th>
  </tr>

  <%= render :partial => @topics, :spacer_template => "topic_splitter" %>
</table>


----------_topic.html
  <tr>
    <td><%= topic.name %></td>
    <td><%= topic.title %></td>
    <td><%= topic.content %></td>
  </tr>


----------topic_splitter.html
  <tr>
    <td>-</td>
    <td>-</td>
    <td>-</td>
    <td>-</td>
    <td>-</td>
    <td>-</td>
  </tr>


контроллёр
  def index
    @topics = Topic.all

    respond_to do |format|
      format.html {  }
      format.json { render json: @topics }
      format.xml { render xml: @topics }
    end
  end