Passing a single object to a nested resource route generates confusing urls.

I'll take an example. (Using Rails 2.3.5, Ubuntu 10.04 x64, Ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux])

#app/models/author.rb
class Author < ActiveRecord::Base
  has_many :books
end

#app/models/book.rb
class Book < ActiveRecord::Base
  belongs_to :author
end

#config/routes.rb
map.resources :authors do |author|
  author.resources :books
end

#app/controllers/authors_controller.rb
class AuthorsController < ApplicationController
end

<%# app/views/authors/show.html.erb %>
<%# Let's say Author#1 has 5 Book#1,#2,#3,#4,#5. %>
<% Author.first.books.each { |book| %>
  <%= edit_author_book_path(book) %> <%# I know two argument should have been passed. %>
<% } %>

Now visit - /authors/1, it generates -

  /authors/1/books/1/edit 
  /authors/2/books/1/edit 
  /authors/3/books/1/edit 
  /authors/4/books/1/edit 
  /authors/5/books/1/edit

While it should have either generated following or should have raised an error.

  /authors/1/books/1/edit 
  /authors/1/books/2/edit 
  /authors/1/books/3/edit 
  /authors/1/books/4/edit 
  /authors/1/books/5/edit

Please note that this bug is very specific, i.e., it happens only when you visit /authors/1 page. On rest of the pages it will generate ActionController::RoutingError.