Added new purchase scaffold.

app/assets/javascripts/purchases.js.coffee

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+# 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/purchases.css.scss

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

app/assets/stylesheets/scaffolds.css.scss

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+body {
+  background-color: #fff;
+  color: #333;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+p, ol, ul, td {
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+pre {
+  background-color: #eee;
+  padding: 10px;
+  font-size: 11px;
+}
+
+a {
+  color: #000;
+  &:visited {
+    color: #666;
+  }
+  &:hover {
+    color: #fff;
+    background-color: #000;
+  }
+}
+
+div {
+  &.field, &.actions {
+    margin-bottom: 10px;
+  }
+}
+
+#notice {
+  color: green;
+}
+
+.field_with_errors {
+  padding: 2px;
+  background-color: red;
+  display: table;
+}
+
+#error_explanation {
+  width: 450px;
+  border: 2px solid red;
+  padding: 7px;
+  padding-bottom: 0;
+  margin-bottom: 20px;
+  background-color: #f0f0f0;
+  h2 {
+    text-align: left;
+    font-weight: bold;
+    padding: 5px 5px 5px 15px;
+    font-size: 12px;
+    margin: -7px;
+    margin-bottom: 0px;
+    background-color: #c00;
+    color: #fff;
+  }
+  ul li {
+    font-size: 12px;
+    list-style: square;
+  }
+}

app/controllers/purchases_controller.rb

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

app/helpers/purchases_helper.rb

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+module PurchasesHelper
+end

app/models/purchase.rb

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+class Purchase < ActiveRecord::Base
+end

app/views/purchases/_form.html.erb

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+<%= form_for(@purchase) do |f| %>
+  <% if @purchase.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@purchase.errors.count, "error") %> prohibited this purchase from being saved:</h2>
+
+      <ul>
+      <% @purchase.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 :cost %><br>
+    <%= f.text_field :cost %>
+  </div>
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/purchases/edit.html.erb

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+<h1>Editing purchase</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', @purchase %> |
+<%= link_to 'Back', purchases_path %>

app/views/purchases/index.html.erb

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+<h1>Listing purchases</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Cost</th>
+      <th colspan="3"></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @purchases.each do |purchase| %>
+      <tr>
+        <td><%= purchase.name %></td>
+        <td><%= purchase.cost %></td>
+        <td><%= link_to 'Show', purchase %></td>
+        <td><%= link_to 'Edit', edit_purchase_path(purchase) %></td>
+        <td><%= link_to 'Destroy', purchase, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Purchase', new_purchase_path %>

app/views/purchases/index.json.jbuilder

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+json.array!(@purchases) do |purchase|
+  json.extract! purchase, :id, :name, :cost
+  json.url purchase_url(purchase, format: :json)
+end

app/views/purchases/new.html.erb

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+<h1>New purchase</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Back', purchases_path %>

app/views/purchases/show.html.erb

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+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>Name:</strong>
+  <%= @purchase.name %>
+</p>
+
+<p>
+  <strong>Cost:</strong>
+  <%= @purchase.cost %>
+</p>
+
+<%= link_to 'Edit', edit_purchase_path(@purchase) %> |
+<%= link_to 'Back', purchases_path %>

app/views/purchases/show.json.jbuilder

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+json.extract! @purchase, :id, :name, :cost, :created_at, :updated_at

config/routes.rb

@@ -1,4 +1,6 @@
 Rails.application.routes.draw do
+  resources :purchases
+
   # The priority is based upon order of creation: first created -> highest priority.
   # See how all your routes lay out with "rake routes".
 

db/migrate/20140810105503_create_purchases.rb

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+class CreatePurchases < ActiveRecord::Migration
+  def change
+    create_table :purchases do |t|
+      t.string :name
+      t.float :cost
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

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+# encoding: UTF-8
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20140810105503) do
+
+  create_table "purchases", force: true do |t|
+    t.string   "name"
+    t.float    "cost"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+end

test/controllers/purchases_controller_test.rb

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+require 'test_helper'
+
+class PurchasesControllerTest < ActionController::TestCase
+  setup do
+    @purchase = purchases(:one)
+  end
+
+  test "should get index" do
+    get :index
+    assert_response :success
+    assert_not_nil assigns(:purchases)
+  end
+
+  test "should get new" do
+    get :new
+    assert_response :success
+  end
+
+  test "should create purchase" do
+    assert_difference('Purchase.count') do
+      post :create, purchase: { cost: @purchase.cost, name: @purchase.name }
+    end
+
+    assert_redirected_to purchase_path(assigns(:purchase))
+  end
+
+  test "should show purchase" do
+    get :show, id: @purchase
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get :edit, id: @purchase
+    assert_response :success
+  end
+
+  test "should update purchase" do
+    patch :update, id: @purchase, purchase: { cost: @purchase.cost, name: @purchase.name }
+    assert_redirected_to purchase_path(assigns(:purchase))
+  end
+
+  test "should destroy purchase" do
+    assert_difference('Purchase.count', -1) do
+      delete :destroy, id: @purchase
+    end
+
+    assert_redirected_to purchases_path
+  end
+end

test/fixtures/purchases.yml

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+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+  cost: 1.5
+
+two:
+  name: MyString
+  cost: 1.5

test/helpers/purchases_helper_test.rb

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+require 'test_helper'
+
+class PurchasesHelperTest < ActionView::TestCase
+end

test/models/purchase_test.rb

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+require 'test_helper'
+
+class PurchaseTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end