Iteration D3.

app/assets/stylesheets/store.scss

@@ -37,6 +37,10 @@
       margin-left: 100px;
       margin-top: 0.5em;
       margin-bottom: 0.8em;
+
+      form, div {
+        display: inline;
+      }
     }
 
     .price {

app/controllers/line_items_controller.rb

@@ -1,6 +1,10 @@
 class LineItemsController < ApplicationController
+  include CurrentCart
+  before_action :set_cart, only: [:create]
   before_action :set_line_item, only: [:show, :edit, :update, :destroy]
 
+  # TODO: Create counter from play time.
+
   # GET /line_items
   # GET /line_items.json
   def index
@@ -24,11 +28,12 @@ class LineItemsController < ApplicationController
   # POST /line_items
   # POST /line_items.json
   def create
-    @line_item = LineItem.new(line_item_params)
+    product = Product.find(params[:product_id])
+    @line_item = @cart.line_items.build(product: product)
 
     respond_to do |format|
       if @line_item.save
-        format.html { redirect_to @line_item, notice: 'Line item was successfully created.' }
+        format.html { redirect_to @line_item.cart, notice: 'Line item was successfully created.' }
         format.json { render :show, status: :created, location: @line_item }
       else
         format.html { render :new }

app/views/carts/show.html.erb

@@ -1,4 +1,9 @@
 <p id="notice"><%= notice %></p>
 
-<%= link_to 'Edit', edit_cart_path(@cart) %> |
-<%= link_to 'Back', carts_path %>
+<h2>Your Pragmatic Cart</h2>
+
+<ul>
+  <% @cart.line_items.each do |item| %>
+    <li><%= item.product.title %></li>
+  <% end %>
+</ul>

app/views/store/index.html.erb

@@ -11,6 +11,7 @@
         <%= sanitize(product.description) %>
         <div class="price_line">
           <span class="price"><%= number_to_currency(product.price) %></span>
+          <%= button_to 'Add To Cart', line_items_path(product_id: product) %>
         </div>
       </div>
     <% end %>

test/controllers/line_items_controller_test.rb

@@ -17,10 +17,13 @@ class LineItemsControllerTest < ActionDispatch::IntegrationTest
 
   test "should create line_item" do
     assert_difference('LineItem.count') do
-      post line_items_url, params: { line_item: { cart_id: @line_item.cart_id, product_id: @line_item.product_id } }
+      post line_items_url, params: { product_id: products(:ruby).id }
     end
 
-    assert_redirected_to line_item_url(LineItem.last)
+    follow_redirect!
+
+    assert_select 'h2', 'Your Pragmatic Cart'
+    assert_select 'li', 'Programming Ruby 1.9'
   end
 
   test "should show line_item" do