cart.rb

来自「ruby on rails web敏捷开发之路第二版 源代码」· RB 代码 · 共 36 行

#---
# Excerpted from "Agile Web Development with Rails, 2nd Ed."
# We make no guarantees that this code is fit for any purpose. 
# Visit http://www.pragmaticprogrammer.com/titles/rails2 for more book information.
#---
class Cart
  
  attr_reader :items
  
  def initialize
    @items = []
  end
  

  def add_product(product)
    current_item = @items.find {|item| item.product == product}
    if current_item
      current_item.increment_quantity
    else
      current_item = CartItem.new(product)
      @items << current_item
    end
    current_item
  end

  
  def total_items
    @items.sum { |item| item.quantity }
  end
  
  
  def total_price
    @items.sum { |item| item.price }
  end
end