簡単インストールから始める初心者のためのRuby on Railsチュートリアル：開発現場でちゃんと使えるRails 4入門（1）（3/3 ページ）

<h1>Listing books</h1>
<table>
  <thead>
    <tr>
      <th>Title</th>
      <th>Outline</th>
      <th></th>
      <th></th>
      <th></th>
    </tr>
  </thead>
 <tbody>
   <% @books.each do |book| %>
     <tr>
       <td><%= book.title %></td>
       <td><%= book.outline %></td>
       <td><%= link_to 'Show', book %></td>
       <td><%= link_to 'Edit', edit_book_path(book) %></td>
       <td><%= link_to 'Destroy', book, method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>
<br>
<%= link_to 'New Book', new_book_path %>

class BooksController < ApplicationController
  before_action :set_book, only: [:show, :edit, :update, :destroy]
  # GET /books
  # GET /books.json
  def index
    @books = Book.all
  end
  # GET /books/1
  # GET /books/1.json
  def show
  end
  # GET /books/new
  def new
    @book = Book.new
  end
  # GET /books/1/edit
  def edit
  end
  # POST /books
  # POST /books.json
  def create
    @book = Book.new(book_params)
    respond_to do |format|
      if @book.save
        format.html { redirect_to @book, notice: 'Book was successfully created.' }
        format.json { render action: 'show', status: :created, location: @book }
      else
        format.html { render action: 'new' }
        format.json { render json: @book.errors, status: :unprocessable_entity }
      end
    end
  end
  # PATCH/PUT /books/1
  # PATCH/PUT /books/1.json
  def update
    respond_to do |format|
      if @book.update(book_params)
        format.html { redirect_to @book, notice: 'Book was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @book.errors, status: :unprocessable_entity }
      end
    end
  end
  # DELETE /books/1
  # DELETE /books/1.json
  def destroy
    @book.destroy
    respond_to do |format|
      format.html { redirect_to books_url }
      format.json { head :no_content }
    end
  end
  private
    # Use callbacks to share common setup or constraints between actions.
    def set_book
      @book = Book.find(params[:id])
    end
    # Never trust parameters from the scary internet, only allow the white list through.
    def book_params
      params.require(:book).permit(:title, :author, :outline)
    end
  end

class Book < ActiveRecord::Base
end