Hi guys,

I'm having trouble getting named routes and form_for to play nicely in quite 
the way I would expect.  Here's a quick summary of what I've got going on:

Named route:  
        resources :thread, :class_name => "forum_thread"

Controller name:
        forum_thread_controller

Model object:
        forum_thread


In both my new and edit actions I'm setting up an @thread variable:
        @thread = ForumThread.new

1.)  My first attempt at writing the form_for looked something like this:

<%= form_for @thread do |f| %>
.....
<% end>

This didn't work because @thread tries to use a path involving the string 
"forum_thread", which doesn't have a matching route and which I don't want.  


2.)  So that's fine, I figured I'd just use named routes.  So I tried this:

<%= form_for @thread, :as => :thread, :url => thread_path(@thread) do |f| %>
....
<% end >

This works for edit actions, but not for new actions.  On new I get the 
following error:

No route matches {:action=>"destroy", :controller=>"forum_thread", 
:id=>#<ForumThread id: nil, .....>}


3.)  So then I tried:

<%= form_for @thread, :as => :thread, :url => threads_path(@thread) do |f| %>
....
<% end >

This doesn't work for edit, and sorta works for new except it outputs the 
following HTML, which makes the respond_to block unhappy:

<form action="/thread?format=" class="thread_new" id="thread_new" 
method="post">....


4.)  So then I tried:

<%= form_for @thread, :as => :thread, :url => threads_path do |f| %>
....
<% end >

Now everything works for new, but not for edit!  (Because the ID of the element 
being edited isn't emitted as part of the action):

<form action="/thread" class="thread_edit" id="thread_edit" method="post">


So:
1.  Is there some way to use a named route that uses a custom class name and 
still be able to reuse my form partial for both new and edit actions?  Or am I 
stuck writing two forms?
2.  Is the error I received in #2 a bug in Rails 3 or expected behavior?
3.  Is the erroneous output in #3 a bug in Rails 3 or expected behavior?


My sincere thanks in advance for your help!

-Jury

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