I wont to add parent selection combobox on rename page, but when I change field type from text_field to collection_select string "Parent page" removed :(, how can I fix it?

!select-in-rename.png!

My patch for app/views/wiki/rename.rhtml

9c9
< 
<%= f.text_field :parent_title, :size => 100  %>
---
> 
<%= f.collection_select :parent_title, WikiPage.find(:all, :conditions => ["id <> ? ", @page.id ]), :title, :pretty_title, {:prompt => ""} %>

P.S.

I am novice in RoR