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<h2>Order Details</h2> <% for item in @order.order_items %> <%= link_to item.book.title, :action => "show", :controller => "catalog", :id => item.book.id %> <%= pluralize(item.amount, "pc", "pcs") %>, $<%= item.price * item.amount %></br> <% end %> <p> <%= button_to "Close Order", :action => 'close', :id => @order unless @order.closed %> </p> At the top of the page, we show the navigation and order total. Next, we show the contact information, shipping address, and order details sections. At the bottom, we display a button that allows George to close the order, but only if the order hasn t been closed already, which is checked by calling the closed method on the Order model. Note that the page will generate an error until we have added the code shown here to the Order model (app/models/order.rb): def closed status == 'closed' end Let s perform an acceptance test. Click the View button from the view orders page (shown in Figures 9-13 and 9-14). You should now see the order details, as shown in Figure 9-15.

Customer Groups: Group Product Pricing (Tier Pricing)

The Close Order user story is the last one we ll implement in this sprint. It is used by George (after he has shipped the order) to set the order status to closed. The user story requires that we change the close action in order_controller.rb as follows: def close order = Order.find(params[:id]) order.close flash[:notice] = "Order #{order.id} has been closed" redirect_to :action => 'index', :id => 'closed' end The code finds the specified order and calls the close method on the Order model (app/models/order.rb): def close self.status = 'closed' save! end This method sets the status to closed and saves the order. After this, the action sets a flash message and redirects to the Closed section of the view orders page. Test the Close Order user story by closing an order. View the details of a processed order (click the View button for the transaction on the view orders page), and you should see the Close Order button at the bottom of the order details page, as shown in Figure 9-16. Click the Close Order button, and you are redirected to the page shown in Figure 9-17. This ends our implementation of the checkout and order-processing functionality. However, you still need to take into account two other items when processing orders: shipping costs and taxes. We ll take a brief look at those calculations next.

The cmp, key, and reverse arguments are available in the sorted function as well. In many cases, using custom functions for cmp or key will be useful you learn how to define your own functions in 6.

Magento allows you to specify product pricing based upon a customer s group and a specific quantity amount. To adjust product pricing, navigate to Catalog Manage Products and select the product you want to adjust, then click on Prices to work with tier pricing. Group product pricing must be assigned to each product individually (see Figure 6-15).

For calculating Federal Express (FedEx) and United Parcel Service (UPS) shipping costs, you can use the handy Shipping RubyGem (http://shipping.rubyforge.org/).

Figure 6-15. Setting up Tier Pricing for multiple customer groups Tier Pricing works twofold. You can assign pricing based on customer groups, but you can also assign volume discounts that are dependent on the specific quantities a customer purchases. You can also assign pricing to different web sites and different customer groups. In this example, I ve created a Tier Pricing setup for each one of our customer groups. If you do not specify a price for your one particular group, they will be presented with the default price. In this example, it s $16.00. Customers must be assigned to their respective groups and be logged in to see the updating pricing. Customers are blind to Tier Pricing and will only be presented with the Tier that they are assigned to. Alternatively, you can set up a Tier Pricing system aimed at only one customer group. In this example, I set up Tier Pricing for just the Wholesale customer group. This gives anyone inside the wholesale group a discount that increases as they purchase more products. This type of pricing will only affect wholesale customers that are logged in, no other customer groups will receive a discount (see Figure 6-16).

Tip If you would like to read more about sorting, you may want to check out Andrew Dalke s Sorting