new.html.haml

= form_for :user, url: user_path do |f|
  %p
    = f.label :name
    = f.text_field :name
  %p
    = f.label :favorite_number
    = f.text_field :favorite_number
  %p
    = f.label :bio
    = f.text_area :bio
  %p
    = f.submit

rake output

user_book_post_index GET    /user/:user_id/book/:book_id/post(.:format)          post#index
                     POST   /user/:user_id/book/:book_id/post(.:format)          post#create
  new_user_book_post GET    /user/:user_id/book/:book_id/post/new(.:format)      post#new
 edit_user_book_post GET    /user/:user_id/book/:book_id/post/:id/edit(.:format) post#edit
      user_book_post GET    /user/:user_id/book/:book_id/post/:id(.:format)      post#show
                     PUT    /user/:user_id/book/:book_id/post/:id(.:format)      post#update
                     DELETE /user/:user_id/book/:book_id/post/:id(.:format)      post#destroy
     user_book_index GET    /user/:user_id/book(.:format)                        book#index
                     POST   /user/:user_id/book(.:format)                        book#create
       new_user_book GET    /user/:user_id/book/new(.:format)                    book#new
      edit_user_book GET    /user/:user_id/book/:id/edit(.:format)               book#edit
           user_book GET    /user/:user_id/book/:id(.:format)                    book#show
                     PUT    /user/:user_id/book/:id(.:format)                    book#update
                     DELETE /user/:user_id/book/:id(.:format)                    book#destroy
          user_index GET    /user(.:format)                                      user#index
                     POST   /user(.:format)                                      user#create
            new_user GET    /user/new(.:format)                                  user#new
           edit_user GET    /user/:id/edit(.:format)                             user#edit
                user GET    /user/:id(.:format)                                  user#show
                     PUT    /user/:id(.:format)                                  user#update
                     DELETE /user/:id(.:format)                                  user#destroy
                root        /                                                    welcome#index

ruby_routes.rb

Dogears::Application.routes.draw do
  resources :user do
    resources :book do
      resources :post
    end
  end
end