Iteration F4.

app/controllers/carts_controller.rb

@@ -59,7 +59,7 @@ class CartsController < ApplicationController
     @cart.destroy if @cart.id == session[:cart_id]
     session[:cart_id] = nil
     respond_to do |format|
-      format.html { redirect_to store_index_url, notice: 'Your cart is currently empty.' }
+      format.html { redirect_to store_index_url }
       format.json { head :no_content }
     end
   end

app/helpers/application_helper.rb

@@ -1,2 +1,8 @@
 module ApplicationHelper
+  def hidden_div_if(condition, attributes = {}, &block)
+    if condition
+      attributes["style"] = "display: none"
+    end
+    content_tag("div", attributes, &block)
+  end
 end

app/views/layouts/application.html.erb

@@ -15,11 +15,11 @@
     </div>
     <div id="columns">
       <div id="side">
-        <div id="cart">
-          <% if @cart %>
+        <% if @cart %>
+          <%= hidden_div_if(@cart.line_items.empty?, id: 'cart') do %>
             <%= render @cart %>
           <% end %>
-        </div>
+        <% end %>
 
         <ul>
           <li><a href="/">Home</a></li>

app/views/line_items/create.js.erb

@@ -1,3 +1,5 @@
+if ($('#cart tr').length == 1) { $('#cart').show('blind', 1000); }
+
 $('#cart').html("<%=j render(@cart)  %>")
 
 $('#current_item').css({'background-color':'#88ff88'})