Rails - Feb 2007 - select a id

I have a database called adverts with an field heading_id
Then i create a select with the options from the table heading, name.
But when i save that form_tag the field heading_id is currently NULL all
other fields are saved but heading_id doesn''t changed



<%= select("advert", "heading_id",
Heading.find(:all).collect {|p| [
p.name, p.id ] }, { :prompt => "selecteer een rubriek"})
%>

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Now i find out that when i set the form options in a partial it works 
fine.
But when i set the options directly into the same view the heading_id is 
empty.
My question is why is a partial needed to get an select working

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