Rails 3.1.3

I have tables, Video and Script having association,

Video 1 --- n Script

So, every Script needs the parent id, in this case, video_id.

If I simply create a new Script instance, the view renders as follows.

<%= render :partial => "new_script", :locals => { :script =>
Script.new(:video_id => @video.id)} %>

which works fine. Now I would like to develop further. The Script
objects may have already existed and if so, I want to update after
editing them.
So I tried,

<%= render :partial => "create_or_update_script",
:locals => { :script => Script.find_or_create_by_video_id(:video_id =>
@video.id)} %>

renders a partial,

<%= form_for script,
:url=>{:controller=>'scripts', :action=>'create_or_update'},
:remote => true do |f| %>
<%= f.hidden_field :video_id %>
<%= f.text_field :startp, :readonly => true %>
<%= f.text_field :text %>
<%= f.submit "create_or_update" %>
<% end %>

But this will set "Script id" to be "Video id", which are supposed to be
distinct from each other.

I assume the problem is the way I use "create_or_update".
Could anyone tell me where the problem is and hopefully the solution?

Thanks in advance.

soichi

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