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gsub! is a method that can be used to replace parts of a String object in place. It takes two parameters: a regular expression that is to be sought in the string and a replacement string. In our case, we want to remove the book_ in front of the actual id number, so we replace it with an empty string. After the call, params[:id] has only the numeric id of the book in question and can thus be used in the Book.find call on the following line. If the expression is not found in the string which is the case when the action is called normally by clicking the + link, resulting in params[:id] being 22, for example the string is left untouched. That was everything needed to make drag-and-drop work. We re now ready with the first functionality of our shopping cart: adding items to it. Run the functional tests, see them roar through, and finally try out the cart in your browser (see Figure 5-2), basking in the glory of being an Ajax developer. If you want to make sure the system works even without Ajax, turn off JavaScript in your browser and try to add items to your cart the old-fashioned way.

Method: catalog_product.currentStore ($store_view_code)

Removing items from the shopping cart is pretty much the inverse action of adding an item. Therefore, we can duplicate much of the code we did for the adding part, with some slight modifications. First, we extend the functional test case in test/functional/cart_controller_test.rb to also test for item removal: def test_removing post :add, :id => 4 assert_equal [Book.find(4)], Cart.find(@request.session[:cart_id]).books post :remove, :id => 4 assert_equal [], Cart.find(@request.session[:cart_id]).books end def test_removing_with_xhr post :add, :id => 4 assert_equal [Book.find(4)], Cart.find(@request.session[:cart_id]).books xhr :post, :remove, :id => 4 assert_equal [], Cart.find(@request.session[:cart_id]).books end Just as with the addition, the first test checks that the removal of items works correctly with the traditional way and the second one tests the Ajax functionality. We start implementing the removal functionality by adding a remove method to the Cart class in app/models/cart.rb: class Cart < ActiveRecord::Base has_many :cart_items has_many :books, :through => :cart_items def add(book_id) items = cart_items.find_all_by_book_id(book_id) book = Book.find(book_id) if items.size < 1 ci = cart_items.create(:book_id => book_id, :amount => 1, :price => book.price) else ci = items.first ci.update_attribute(:amount, ci.amount + 1) end ci end

Note If division by zero occurs and muffling is turned on, the calc method will (implicitly) return None.

Description: Gets the store_id. Return: Int, the store_id. Argument: $store_view_code (optional). Select Admin Panel, System, Manage Stores; select a store under the Store View Name, and you ll find the code listed there.

def remove(book_id) ci = cart_items.find_by_book_id(book_id) if ci.amount > 1 ci.update_attribute(:amount, ci.amount - 1) else CartItem.destroy(ci.id) end return ci end def total cart_items.inject(0) {|sum, n| n.price * n.amount + sum} end end The remove method first uses a magical find_by_attribute_name finder method to find the cart item in the current cart that holds a certain title. Then the method uses the update_attribute method to make the amount attribute one smaller, except if the amount was already one (or less, but that shouldn t be possible). In that case, the entire cart item is deleted from the cart. We continue the copying and slightly modifying path in app/controllers/ cart_controller.rb: class CartController < ApplicationController layout "catalog" before_filter :initialize_cart def add @book = Book.find(params[:id])

The following is an example of how this class may be used, both with and without muffling: >>> calculator = MuffledCalculator() >>> calculator.calc('10/2') 5 >>> calculator.calc('10/0') # No muffling Traceback (most recent call last): File "<stdin>", line 1, in File "MuffledCalculator.py", line 6, in calc return eval(expr) File "<string>", line 0, in ZeroDivisionError: integer division or modulo by zero >>> calculator.muffled = 1 >>> calculator.calc('10/0') Division by zero is illegal As you can see, when the calculator is not muffled, the ZeroDivisionError is caught but passed on.

// Set the store code $store_view_code = 'dollarstore'; // using SOAP method $result = $client->call($session_id, 'catalog_product.currentStore', $store_view_code); // returns the store_id echo $result;

if request.xhr @item = @cart.add(params[:id]) flash.now[:cart_notice] = "Added <em>#{@item.book.title}</em>" render :action => "add_with_ajax" elsif request.post @item = @cart.add(params[:id]) flash[:cart_notice] = "Added <em>#{@item.book.title}</em>" redirect_to:controller => "catalog" else render end end def remove @book = Book.find(params[:id]) if request.xhr @item = @cart.remove(params[:id]) flash.now[:cart_notice] = "Removed 1 <em>#{@item.book.title}</em>" render :action => "remove_with_ajax" elsif request.post @item = @cart.remove(params[:id]) flash[:cart_notice] = "Removed 1 <em>#{@item.book.title}</em>" redirect_to :controller => "catalog" else render end end end

Method: catalog_product.list ($filters, $store_view_code)