Acciones especificas para un recurso/miembro en particular. Manejo de sessiones

books_general.rb

# config/routes.rb

#agregancdo una accion a un recurso/miembro en particular 
resources :books do
  member do
    put :publish
  end
end
# o
put "/books/:id/publish", to: "books#publish"
# Genera: rake routes
publish_book PUT "/books/:id/publish" "books#publish"

#los links se generarian asi:
link_to "Publicar", publish_book(@book)

#Generar migraciones para agregar campos de publicacion
rails g migration AddPublicationWorkflowToBooks

#genera la migracion donde agregamos los campos:
class AddPublicationWorkflowToBooks
  def change
    add_column :books, :publish_date, :date_time
    add_column :books, :publish_state, :string

    add_index :books, :publish_date
  end
end

##Sesiones
#Como mantener seleccionado el ultimo autor.
#app/views/books/_form.html.erb
<div class="field">
  <%= f.label :author_id, "Author" %><br>
  <%= f.select :author_id, options_for_select(Author.all.map{|a| [a.fullname, a.id] }, @author_id), { include_blank: true } %>
</div>

#app/controllers/books_controller.rb
  def new
    @author_id = session[:author_id] #recupero de session el ultimo author elegido

    @book = Book.new
    render :new
  end

  def create
    @book = Book.new(book_params)
    @book.save
    ...
    session[:author_id] = @book.author_id #preservo en session el ultimo autor elegido
    ...
    render :show
  end
  
  def publish
    @book = Book.find(params[:id])
    @book.publish!

    render :show
  end


#app/models/book.rb
  def publish!
    self.publish_date  = Time.now
    self.publish_state = "Published"
    #Truquito, les deje la inquietud de que corroboren que el book queda publicado 😉
  end
  
  def published?
    publish_date.present? #alternativa 1
    publish_state == "Published" #alternativa 2
  end
  
#Recurso para publicar la app en heroku
https://devcenter.heroku.com/articles/getting-started-with-rails4