Thanks for the reply. I've now fixed the html (removed the table), but
it didn't fix the problem. The edit view is:
<h1>Editing orf</h1>
<% form_for @orf do |f| %>
  <%= f.error_messages %>
  <%= h @orf.locus_tag %>
  <%= f.text_field 'current_annotation', :size => 50  %>
  <%= f.submit "Update" %>
  <%= button_to "Undo last change", :action => :undo_last_change, :id
=> @orf %>
<% end %>

I'm not sure what you mean about taking a look at the raw data posted
by the browser to see if it is malformed. I turned on Firebug and
looked at what it was trying to do when I pressed my "Update" button
and I don't see anything wrong. It shows:

_method put
commit  Update
orf[current_annotation] hypothetical proteinski

That looks OK to me , but I don't really know what I should be looking
for. I was trying to change the current_annotation from hypothetical
protein to hypothetical proteinski, so it looks like it tried.  But
the change doesn't happen.  Any suggestion of how to troubleshoot this
further?

On Apr 2, 4:56 pm, Frederick Cheung <[email protected]>
wrote:
> On Apr 2, 6:23 pm,dirtbug<[email protected]> wrote:> I have an update button 
> that doesn't update.  Watching the server
> > during the attempt, I see:
>
> > Processing OrvesController#update (for 128.119.60.171 at 2010-04-02
> > 13:13:29) [PUT]
> >   Parameters: {"orf"=>nil, "commit"=>"Update", "id"=>"19544"}
>
> > orf is my model I'm trying to update in the database.  Why is it nil?
>
> It's probably worth taking a look at the raw data posted by the
> browser - if it is malformed in some way that could be causing rails
> to parse it in a funny way. It probably doesn't help that your html is
> malformed (a td must be contained in a tr or similar, i'm pretty sure
> you can't stick a form in a table like that and the button_to will
> create a second form (ie you'll have a form nested in another form)
>
> Fred
>
> > The view for the page with the update button is called edit.html.erb
> > and contains:
>
> > <h1>Editing orf</h1>
> > <table>
> >         <% form_for @orf do |f| %></td>
> >           <td><%= f.error_messages %>
> >           <td><%= h @orf.locus_tag %></td>
> >           <td><%= f.text_field 'current_annotation', :size => 50  %></td>
> >                 <td><%= f.submit "Update" %></td>
> >                 <td><%= button_to "Undo last change", :action
> > => :undo_last_change, :id => @orf %></td>
> >         <% end %>
>
> > orf's attributes locus_tag and current_annotation are being correctly
> > displayed.
>
> > Here's the update method:
>
> >   def update
> >     @orf = Orf.find(params[:id])
> >     if @orf.update_attributes(params[:orf])
> >       flash[:notice] = 'Orf was successfully updated.'
> >       redirect_to orf_path
> >     else
> >       flash[:notice] = 'Update failed.'
> >       redirect_to orf_path
> >     end
> >   end
>
> > routes.rb contains the line:
> >   map.resources :orves
>
> > No error message appears in the web browser.  The update just doesn't
> > change anything.
>
> > I'm running Rails 2.3.0.
>
> > Any idea what I'm doing wrong?

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