Nested models and forms

Rails
1

Hi,

I have been trying to use the new nested models & forms feature in rails
2.3

#helper

def add_job_profile_link(name, form, vacancy)
link_to_function name do |page|
profile = render(:partial => ‘job_profile’, :locals => { :f =>
form, :job_profile => vacancy.job_profiles.build })
page << %{
$(‘job_profiles’).insert({ bottom: “#{ escape_javascript profile
}”});
}
end
end

#view

<%= render(:partial => 'job_profile', :locals => { :f => f, :job_profile => @vacancy.job_profiles.build }) %>

<%= add_job_profile_link("Add a job profile", f, @vacancy) %>

The above code is displaying the fields, but on submission picks up
values
for just 2 nested models. I tried removing the default rendered partial,
and
then it picks up just 1 set of values.
Am i doing something wrong over here?
Does @vacancy.job_profiles.build has different meanings in view and
helper?

Regards

–
Sahil