<% if @book.errors.any? %>

<% @book.errors.full_messages.each do |message| %>

<%= message %>

<% end %>

<% end %> <%= form_for @book, url: author_books_path(@author) do |f| %>

<%= f.label :title %> <%= f.text_field :title %>

<%= f.label :description %> <%= f.text_area :description %>

<% end %>