Rails - Oct 2010 - Help with routes

Switching our routes file from Rails2 to Rails3 DSl uncovered an odd
situation, of my own making, but I am having some difficultly imagining
how to fix it.

Basically I have a commonplace: user -> user_role (clearance) <- role
type arrangement where:

User
  has_many  :roles, :through => :clearances
  has_many  :clearances

Clearance
  belongs_to :role
  belongs_to :user

and

Role
  has_many  :users, :through => :clearances
  has_many  :clearances

What I am trying to do is to link through new_user_role_path(@user).
But I get the following error when I try:

ActionController::RoutingError: No route matches
  {:action=>"new", :controller=>"user_roles"}

The thing is that when I run rake routes I see this:

 new_user_role GET    /users/:user_id/role/new(.:format)
                      {:controller=>"user_roles",
:action=>"new"}

So, I am somewhat nonplussed as to what is going on. I probably am
misunderstanding something basic but from my point of view it seems
that the route that is shown as missing is actually there.  Is there
something else I am overlooking?

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