Question

我正在使用Ruby和OO开始学习，并且我已经接受了关于OO的测试。

这是一个商店场景，我必须创建类，方法，调用...... 目前我已创建课程付款和产品类（实体，会员，数字）

    class Payment
      attr_reader :authorization_number, :amount, :invoice, :order, :payment_method, :paid_at, :shipping

      def initialize(attributes = {})
        @authorization_number, @amount = attributes.values_at(:authorization_number, :amount)
        @invoice, @order = attributes.values_at(:invoice, :order)
        @payment_method = attributes.values_at(:payment_method)
        @shipping.extend Shipping
      end

      def pay(paid_at = Time.now)
        @amount = order.total_amount
        @authorization_number = Time.now.to_i
        @invoice = Invoice.new(order.get_address, order.get_address, order)
        @paid_at = paid_at
        order.close(@paid_at)
      extend

      def paid?
        !paid_at.nil?
      end

      def prepare_shipping(order)
        ???
      end
    end

class Product
  attr_reader :name, :description, :type

    def initialize(name, description, type)
        @name = name
        @description = description
        @type = type
    end
end
    class Digital < Product
        include DigitalProduct

        def initialize(name, description, type)
            super(name, description, type)
        end

        def matches?(query)
            query=="digital"
        end
    end

class Physical < Product
    def initialize(name, description, type)
        super(name, description, type)
    end

    def matches?(query)
        query=="physical"
    end
end

class Membership < Product
    attr_reader :membership_status
    include DigitalProduct

    def initialize(name, description, type)
        super(name, description, type)
    end

    def matches?(query)
        query=="membership"
    end

    def activate_membership()
        @membership_status = true;
    end
end

这是我的问题：

1.如果产品是实物，我必须生成运输标签。

1.1如果它是一本书，我必须通知该产品没有税。

2.如果产品是会员资格，我必须激活签名并通过电子邮件通知买家。

如果产品是数码产品，我必须向买家发送电子邮件，并在此产品上给予10美元的折扣。

我做得很好，但现在我希望你的意见知道在OO技术（SOLID）之后创建上述点的最佳方法是什么。

ps：我试图创建，但我的解决方案真的很差，很多ifs。我认为有更好的方法来实现

如果您需要更多信息请告诉我，我还有其他课程。

抱歉我的英语不好。

我已经开发了这个解决方案，我认为这很好......也许你可以给我一个反馈意见。

因此，要解决有关运费和折扣规则的问题，我创建了2个模块Shipping和Discount

module Discount

   def prepare_discount(order)
    total_discount = 0
    order.get_items.each do |item|
      total_discount += item.product.discount
    end
    return total_discount
  end

  def discount
    if matches?("physical")
        return discount_for_physical_product
    elsif matches?("digital")
        return discount_for_digital_product
    elsif matches?("membership")
        return discount_for_membership_product
    elsif matches?("default")
        return discount_for_default_product
    end
  end

  def discount_for_physical_product
      price_discount_for_physical_product = 0
      return price_discount_for_physical_product
  end

  def discount_for_digital_product
    price_discount_for_digital_product = 10.00
    return price_discount_for_digital_product
  end

  def discount_for_default_product
    price_discount_for_digital_product = 10.00
    return price_discount_for_digital_product
  end

  def discount_for_membership_product
      price_discount_for_membership_product = 0
      return price_discount_for_membership_product
  end
end

module Shipping
  def prepare_shipping(order)
    order.get_items.each do |item|
        item.product.shipping
    end
  end

  def shipping
    if matches?("physical")
        shipping_for_physical_product
    elsif matches?("digital")
        shipping_for_digital_product
    elsif matches?("membership")
        shipping_for_membership_product
    elsif matches?("default")
        shipping_for_default_product
    end
  end

  def shipping_for_physical_product
    case @type
      when :book
        create_shipping_label
        notify_buyer_product_without_taxes
      else
        create_shipping_label
    end
  end

  def shipping_for_digital_product
    notify_buyer_via_email
  end

  def shipping_for_membership_product
      notify_buyer_via_email
      activate_membership
  end

  def shipping_for_default_product
      create_shipping_label
      notify_buyer_via_email
  end

  def create_shipping_label
    puts "Creating shipping label ..."
  end

  def notify_buyer_product_without_taxes
    puts "Product exempt from taxes, as provided in the Constitution Art. 150, VI, d."
  end

  def notify_buyer_via_email
    puts "Sending email ..."
  end
end

这种方式Product和Order可以扩展两个模块并实现逻辑。

Ruby - 面向对象的商店示例

0 个答案: