_form.html.erb

<%= form_for(@conversation) do |f| %>
  <% if @conversation.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@conversation.errors.count, "error") %> prohibited this conversation from being saved:</h2>

      <ul>
      <% @conversation.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>

  <div class="field">
    <%= f.label :board_id %><br />
    <%= collection_select(:conversation, :board_id, Board.all, :id, :name, :prompt => true) %>
  </div>
  
  <div clas="field">
      <%= f.label :body %><br />
      <%= text_area(@comments, :body, :size => "60x10")%>
  </div>      
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>