Rails Nested Singular Resource Routing

I have a simple User model with a singular nested Profile resource so in my routes.rb I have:

resources :users do
  resource :profile, :only => [:edit, :update, :show]
end

This generates the expected routes:

edit_user_profile GET    /users/:user_id/profile/edit(.:format)  {:action=>"edit", :controller=>"profiles"}
     user_profile GET    /users/:user_id/profile(.:format)       {:action=>"show", :controller=>"profiles"}
     user_profile PUT    /users/:user_id/profile(.:format)       {:action=>"update", :controller=>"profiles"}

I've created a simple controller update method that updates the model and then redirects upon successful update:

def update
  @profile = Profile.find_by_user开发者_高级运维_id(params[:user_id])
  @user = User.find_by_id(params[:user_id])

  respond_to do |format|
    if @profile.update_attributes(params[:profile])
      format.html { redirect_to( user_profile_path(@user, @profile), :notice => 'Profile was successfully updated.') }
    else
      # ...
    end
  end
end

The problem is that once the form is submitted, the form redirects to mydomain.com/users/4/profile.22 where 22 happens to be the id of the profile. Clearly this confuses the controllers since the routing interprets the '22' as the format.

My question is, how do I get this to redirect to mydomain.com/users/4/profile instead? I've tried the following variations on the redirect_to statement to no effect, they all result in the same incorrect url:

redirect_to( user_profile_path(@user), ... )
redirect_to( user_profile_path(@user, @profile), ... )
redirect_to([@user, @profile], ... )
redirect_to( @profile, ... )

What's more, using 'user_profile_path(@user)' elsewhere produces the correct url.

Any ideas? Oh, and I'm using Rails 3.0.0 and Ruby 1.9.2 if that helps.

After looking around, it appears that the form generating the update had an incorrect url. If anyone is seeing this issue, it's because I had my form set up as:

form_for [@user, @profile] do |f| ...

This caused the form action to have the incorrect url (of the offending form above). Instead, I used

form_for @profile, :url => user_profile_path(@user) do |f| ...

and everything seemed to work.

You should redirect to user_profile_path(@user) since as your routes says it is:

/users/:user_id/profile(.:format)

If you look at it closely, then you will see, that there is only :user_id parameter needed, thou it is only @user in a path.

/users/:user_id/profile/:id(.:format)

It would be correct if you had resource*s* :profiles in your routes.rb, then as well you could use your path as in your example.

user_profile_path(@user) should be correct. You're sure that one is returning mydomain.com/users/4/profile.22?