‘如果為空值的話會顯示錯誤’

app/views/admin/announcements/_edit_sort.html.erb

@@ -23,7 +23,7 @@
           <%= number_field_tag nil,annc.sort_number,class: 'sort_number',step: 1 %>
         </td>
         <td>
-          <%= annc.title.html_safe %>
+          <%= annc.title.to_s.html_safe %>
         </td>
         <td>
           <%= format_value annc.postdate %>
@@ -32,4 +32,4 @@
     <% end %>
     </tbody>
   </table>
-</div>
+</div>