Rake Routes project_attachment_path

Hello, I'm trying to create a project_attachment_path

In my routes I have:

  resources :projects do
    collection do
        get "attachments/:id/:style.:format" =>
"attachments#download", :as => :attachment
    end
    end

**Problem is in RAKE ROUTES:**

    attachment_projects GET /projects/
attachments/:id/:style.:format
{:action=>"download", :controller=>"attachments"}

It's backwards? Any ideas what I did wrong?

Thanks