app/views/rooms/_room.html.erb
<tr id="tr_<%= room.id %>">
<td><%= room.name %></td>
<td bgcolor= <%= room.color %>></td>
<td><%= button_to 'Edit', edit_room_path(room), id: "edit_room_#{room.id}", method: :get, :remote => true %></td>
<td><%= button_to 'Delete', room, id: "delete_room_#{room.id}", method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>