48-リレーションの調査と準備

app/assets/javascripts/categories.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://coffeescript.org/

app/assets/stylesheets/categories.scss

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

app/controllers/categories_controller.rb

@@ -0,0 +1,74 @@
+class CategoriesController < ApplicationController
+  before_action :set_category, only: [:show, :edit, :update, :destroy]
+
+  # GET /categories
+  # GET /categories.json
+  def index
+    @categories = Category.all
+  end
+
+  # GET /categories/1
+  # GET /categories/1.json
+  def show
+  end
+
+  # GET /categories/new
+  def new
+    @category = Category.new
+  end
+
+  # GET /categories/1/edit
+  def edit
+  end
+
+  # POST /categories
+  # POST /categories.json
+  def create
+    @category = Category.new(category_params)
+
+    respond_to do |format|
+      if @category.save
+        format.html { redirect_to @category, notice: 'Category was successfully created.' }
+        format.json { render :show, status: :created, location: @category }
+      else
+        format.html { render :new }
+        format.json { render json: @category.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /categories/1
+  # PATCH/PUT /categories/1.json
+  def update
+    respond_to do |format|
+      if @category.update(category_params)
+        format.html { redirect_to @category, notice: 'Category was successfully updated.' }
+        format.json { render :show, status: :ok, location: @category }
+      else
+        format.html { render :edit }
+        format.json { render json: @category.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /categories/1
+  # DELETE /categories/1.json
+  def destroy
+    @category.destroy
+    respond_to do |format|
+      format.html { redirect_to categories_url, notice: 'Category was successfully destroyed.' }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_category
+      @category = Category.find(params[:id])
+    end
+
+    # Never trust parameters from the scary internet, only allow the white list through.
+    def category_params
+      params.require(:category).permit(:name, :description)
+    end
+end

app/helpers/categories_helper.rb

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

app/models/category.rb

@@ -0,0 +1,2 @@
+class Category < ActiveRecord::Base
+end

app/views/categories/_category.json.jbuilder

@@ -0,0 +1,2 @@
+json.extract! category, :id, :name, :description, :created_at, :updated_at
+json.url category_url(category, format: :json)

app/views/categories/_form.html.erb

@@ -0,0 +1,25 @@
+<%= form_for(@category) do |f| %>
+  <% if @category.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@category.errors.count, "error") %> prohibited this category from being saved:</h2>
+
+      <ul>
+      <% @category.errors.full_messages.each do |message| %>
+        <li><%= message %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :name %><br>
+    <%= f.text_field :name %>
+  </div>
+  <div class="field">
+    <%= f.label :description %><br>
+    <%= f.text_area :description %>
+  </div>
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/categories/edit.html.erb

@@ -0,0 +1,6 @@
+<h1>Editing Category</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', @category %> |
+<%= link_to 'Back', categories_path %>

app/views/categories/index.html.erb

@@ -0,0 +1,29 @@
+<p id="notice"><%= notice %></p>
+
+<h1>Listing Categories</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Description</th>
+      <th colspan="3"></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @categories.each do |category| %>
+      <tr>
+        <td><%= category.name %></td>
+        <td><%= category.description %></td>
+        <td><%= link_to 'Show', category %></td>
+        <td><%= link_to 'Edit', edit_category_path(category) %></td>
+        <td><%= link_to 'Destroy', category, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Category', new_category_path %>

app/views/categories/index.json.jbuilder

@@ -0,0 +1 @@
+json.array! @categories, partial: 'categories/category', as: :category

app/views/categories/new.html.erb

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

app/views/categories/show.html.erb

@@ -0,0 +1,14 @@
+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>Name:</strong>
+  <%= @category.name %>
+</p>
+
+<p>
+  <strong>Description:</strong>
+  <%= @category.description %>
+</p>
+
+<%= link_to 'Edit', edit_category_path(@category) %> |
+<%= link_to 'Back', categories_path %>

app/views/categories/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "categories/category", category: @category

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  resources :categories
   root 'todos#index'
 
   resources :todos do

db/migrate/20160729082629_create_categories.rb

@@ -0,0 +1,10 @@
+class CreateCategories < ActiveRecord::Migration
+  def change
+    create_table :categories do |t|
+      t.string :name
+      t.text :description
+
+      t.timestamps null: false
+    end
+  end
+end

db/schema.rb

@@ -11,7 +11,14 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160729064758) do
+ActiveRecord::Schema.define(version: 20160729082629) do
+
+  create_table "categories", force: :cascade do |t|
+    t.string   "name"
+    t.text     "description"
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+  end
 
   create_table "todos", force: :cascade do |t|
     t.string   "title"

test/controllers/categories_controller_test.rb

@@ -0,0 +1,49 @@
+require 'test_helper'
+
+class CategoriesControllerTest < ActionController::TestCase
+  setup do
+    @category = categories(:one)
+  end
+
+  test "should get index" do
+    get :index
+    assert_response :success
+    assert_not_nil assigns(:categories)
+  end
+
+  test "should get new" do
+    get :new
+    assert_response :success
+  end
+
+  test "should create category" do
+    assert_difference('Category.count') do
+      post :create, category: { description: @category.description, name: @category.name }
+    end
+
+    assert_redirected_to category_path(assigns(:category))
+  end
+
+  test "should show category" do
+    get :show, id: @category
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get :edit, id: @category
+    assert_response :success
+  end
+
+  test "should update category" do
+    patch :update, id: @category, category: { description: @category.description, name: @category.name }
+    assert_redirected_to category_path(assigns(:category))
+  end
+
+  test "should destroy category" do
+    assert_difference('Category.count', -1) do
+      delete :destroy, id: @category
+    end
+
+    assert_redirected_to categories_path
+  end
+end

test/fixtures/categories.yml

@@ -0,0 +1,9 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+  description: MyText
+
+two:
+  name: MyString
+  description: MyText

test/models/category_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class CategoryTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end