一応提出

app/assets/javascripts/memos.js.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/

app/assets/stylesheets/memos.css.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the Memos controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/books_controller.rb

@@ -16,6 +16,9 @@ def index
   # GET /books/1
   # GET /books/1.json
   def show
+    @book = Book.find(params[:id])
+    @memo = @book.memos.build
+
     respond_to do |format|
       format.html # show.html.erb
       format.xml { render xml: @book }

app/controllers/memos_controller.rb

@@ -0,0 +1,66 @@
+class MemosController < ApplicationController
+
+  before_filter :load_book
+
+  def load_book
+    @book = Book.find(params[:book_id])
+  end
+
+  # GET /memos
+  # GET /memos.json
+  def index
+    @memos = @book.memos.all
+
+    respond_to do |format|
+      format.html # index.html.erb
+      format.json { render json: @memos }
+    end
+  end
+
+  # GET /memos/1
+  # GET /memos/1.json
+  def show
+  end
+
+  # GET /memos/new
+  # GET /memos/new.json
+  def new
+  end
+
+  # GET /memos/1/edit
+  def edit
+  end
+
+  # POST /memos
+  # POST /memos.json
+  def create
+    @memo = @book.memos.build(params[:memo])
+
+    respond_to do |format|
+      if @memo.save
+        format.html { redirect_to @book, notice: 'Memo was successfully created.' }
+        format.json { render json: @memo, status: :created, location: @memo }
+      else
+        format.html { render 'books/show' }
+        format.json { render json: @memo.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PUT /memos/1
+  # PUT /memos/1.json
+  def update
+  end
+
+  # DELETE /memos/1
+  # DELETE /memos/1.json
+  def destroy
+    @memo = @book.memos.find(params[:id])
+    @memo.destroy
+
+    respond_to do |format|
+      format.html { redirect_to book_url(@book) }
+      format.json { head :no_content }
+    end
+  end
+end

app/helpers/memos_helper.rb

@@ -0,0 +1,2 @@
+module MemosHelper
+end

app/models/book.rb

@@ -1,5 +1,6 @@
 # encoding: UTF-8
 class Book < ActiveRecord::Base
+  has_many :memos
   attr_accessible :memo, :purchased_on, :title
   validates :title, :presence => true
 

app/models/memo.rb

@@ -0,0 +1,7 @@
+class Memo < ActiveRecord::Base
+  belongs_to :book
+  attr_accessible :body
+
+  validates :body, :presence => true, :length => { :maximum => 100 } 
+
+end

app/views/books/show.html.erb

@@ -15,6 +15,8 @@
   <%= @book.purchased_on %>
 </p>
 
-
 <%= link_to 'Edit', edit_book_path(@book) %> |
 <%= link_to 'Back', books_path %>
+<hr />
+<%= render 'memos/index' %>
+<%= render 'memos/form' %>

app/views/memos/_form.html.erb

@@ -0,0 +1,21 @@
+<%= form_for([@book, @memo]) do |f| %>
+  <% if @memo.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@memo.errors.count, "error") %> prohibited this memo from being saved:</h2>
+
+      <ul>
+      <% @memo.errors.full_messages.each do |msg| %>
+        <li><%= msg %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :body %><br />
+    <%= f.text_area :body %>
+  </div>
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/memos/_index.html.erb

@@ -0,0 +1,8 @@
+<h2>Memos</h2>
+<ul>
+<% @book.memos.each do |memo| %>
+  <% unless memo.id.nil? %>
+    <li><%= memo.body %> <%= link_to 'Destory', book_memo_path(@book, memo), confirm: 'r u sure?', method: :delete %></li>
+  <% end %>
+<% end %>
+</ul>

app/views/memos/edit.html.erb

@@ -0,0 +1,6 @@
+<h1>Editing memo</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', [@book, @memo] %> |
+<%= link_to 'Back', book_memos_path %>

app/views/memos/index.html.erb

@@ -0,0 +1,26 @@
+<h1>Listing memos</h1>
+
+<table>
+  <tr>
+    <th>Book</th>
+    <th>Body</th>
+    <th></th>
+    <th></th>
+    <th></th>
+  </tr>
+
+<% @memos.each do |memo| %>
+  <tr>
+    <td><%= memo.book %></td>
+    <td><%= memo.body %></td>
+    <td><%= link_to 'Show', book_memo_path(@book, memo) %></td>
+    <td><%= link_to 'Edit', edit_book_memo_path(@book, memo) %></td>
+    <td><%= link_to 'Destroy', book_memo_path(@book, memo), confirm: 'Are you sure?', method: :delete %></td>
+  </tr>
+<% end %>
+</table>
+
+<br />
+
+<%= link_to 'Back', books_path %> |
+<%= link_to 'New Memo', new_book_memo_path %>

app/views/memos/new.html.erb

@@ -0,0 +1,5 @@
+<h1>New memo</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Back', book_memos_path %>

app/views/memos/show.html.erb

@@ -0,0 +1,15 @@
+<p id="notice"><%= notice %></p>
+
+<p>
+  <b>Book:</b>
+  <%= @memo.book %>
+</p>
+
+<p>
+  <b>Body:</b>
+  <%= @memo.body %>
+</p>
+
+
+<%= link_to 'Edit', edit_book_memo_path %> |
+<%= link_to 'Back', book_memos_path %>

config/routes.rb

@@ -1,5 +1,7 @@
 BookMemo2::Application.routes.draw do
-  resources :books
+  resources :books do
+    resources :memos
+  end
 
   # The priority is based upon order of creation:
   # first created -> highest priority.

db/migrate/20120614103230_create_memos.rb

@@ -0,0 +1,11 @@
+class CreateMemos < ActiveRecord::Migration
+  def change
+    create_table :memos do |t|
+      t.references :book
+      t.text :body
+
+      t.timestamps
+    end
+    add_index :memos, :book_id
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20120526050801) do
+ActiveRecord::Schema.define(:version => 20120615004432) do
 
   create_table "books", :force => true do |t|
     t.string   "title"
@@ -21,4 +21,22 @@
     t.datetime "updated_at",   :null => false
   end
 
+  create_table "comments", :force => true do |t|
+    t.integer  "book_id"
+    t.text     "memo"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
+  add_index "comments", ["book_id"], :name => "index_comments_on_book_id"
+
+  create_table "memos", :force => true do |t|
+    t.integer  "book_id"
+    t.text     "body"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
+  add_index "memos", ["book_id"], :name => "index_memos_on_book_id"
+
 end