Rails - Jul 2006 - select(object, method, choices, options = {}, html_options = {})

Hi,
I''m using:
select(object, method, choices, options = {}, html_options = {})
I''ve read the API where there''s this example:
select("post", "person_id", Person.find_all.collect {|p| [
p.name,
p.id ] }, { :include_blank => true })
should give this code:
 <select name="post[person_id]">
    <option></option>
    <option value="1"
selected="selected">David</option>
    <option value="2">Sam</option>
    <option value="3">Tobias</option>
  </select>

The API says:
"By default, post.person_id is the selected option. Specify :selected
=> value to use a different selection or :selected => nil to leave all
options unselected."
But this is not working to me. Is it for anybody?
First I think post.person_id is @post.person_id. Anyway it doesn''t put
the selected property. Even forcing a :selected => value this way:
<%= select(''night'', ''place_id'' ,
Place.find_all.collect {|p| [ p.name,
p.id ] },{:selected => @night.place_id}) %>
doesn''t work.

Thanks,
Enrico

-- 
"The only thing necessary for the triumph of evil
is for good men to do nothing"
 Edmund Burke

> <%= select(''night'', ''place_id'' ,
Place.find_all.collect {|p| [ p.name,
> p.id ] },{:selected => @night.place_id}) %>
casting the value of place_id
:selected => @night.place_id.to_i
I get what I want. I''m not sure about the reason of this, maybe cause
I''m using two models.

-- 
"The only thing necessary for the triumph of evil
is for good men to do nothing"
 Edmund Burke