Rails 4模型关联 - 促销代码

Question

这是购物车。我正在尝试使用促销代码对订单的总价格应用折扣。

我现在想关注这3个模型： 订单 2. promo_code 3. promo_rules

创建订单时，也会创建空的促销代码。与任何其他购物车一样，用户可以在结账时输入促销代码。

订购模式：

var listItems = $("#options li");
listItems.each(function(idx, li) {
    var item = $(li);
    if (item.scrollWidth >  $('#options').innerWidth()) {
        //If true, it means text does not fit in the container
        //Apply your class or css here
    }
});

另外，我正在使用“规则代码”和“金额”字段创建促销规则。

promo_rule.rb

  def create_promo_code
    PromoCode.create(order_id: self.id) 
  end

目标是当用户输入促销代码时，将其与数据库中所有促销规则记录的“规则代码字段”进行比较，如果它与1匹配，则该促销规则与促销代码相关联。然后促销代码中的“apply_promo”布尔值更新为true。

请参阅此处的update_prom_code

class PromoRule < ActiveRecord::Base
    has_many :promo_codes
end

在订单模型中：

class PromoCode < ActiveRecord::Base
    belongs_to  :order
    belongs_to  :promo_rule
    after_update :update_promo_code


    def update_promo_code
        if self.promo_code.present?
            @promo_rule = PromoRule.where("rule_code = ?", self.promo_code).take
            self.promo_rule_id = @promo_rule
            self.apply_promo = true
        end

    end
end

在这里，我正在尝试检查促销代码是否存在且apply_promo是否为真，然后订单促销金额将使用与促销代码和订单相关联的促销规则金额进行更新。

换句话说，一旦促销代码与促销规则相关联，促销规则“金额”就会从订单总额中扣除。有意义吗？

也在订单模型中：

  def apply_promo_code
    if self.promo_code.present? && self.promo_code.apply_promo?
      self.promo = self.promo_rule.amount
    end

  end

什么不起作用 promo_code模型中的update_promo_code

我希望我能清楚地解释我的目标。我知道这有点令人困惑。

以下是模型：

promo_code.rb

  def total
    if self.promo == nil
      self[:total] = subtotal + shipping + tax
    else
      self[:total] = subtotal + shipping - promo + tax     
    end
  end

order.rb

class PromoCode < ActiveRecord::Base
    belongs_to  :order
    belongs_to  :promo_rule
    after_update :update_promo_code


    def update_promo_code
        if self.promo_code.present?
            @promo_rule = PromoRule.where("rule_code = ?", self.promo_code).take
            self.promo_rule_id = @promo_rule
            self.apply_promo = true
        end

    end
end

promo_rule.rb

class Order < ActiveRecord::Base
  belongs_to :order_status
  belongs_to :user
  has_many :order_items
  has_many :products, through: :order_items
  has_one :shipping_address, through: :user
  has_one :purchase
  has_one :promo_code
  has_one :promo_rule, through: :promo_code
  before_create :set_order_status
  before_create :set_order_user
  before_save :update_subtotal
  before_save :update_total
  before_update :update_subtotal
  before_update :update_total  
  before_save :tax  
  before_save :shipping
  after_create :create_promo_code
  before_update :apply_promo_code



  def apply_promo_code
    if self.promo_code.present? && self.promo_code.apply_promo?
      self.promo = self.promo_rule.amount
    end

  end


  def update_order_promo
    self.touch  
  end

  def create_promo_code
    PromoCode.create(order_id: self.id) 
  end


  def subtotal
    order_items.collect { |oi| oi.valid? ? (oi.quantity * oi.unit_price) : 0 }.sum
  end

  def tax
    shipping_subtotal = shipping + subtotal
    self.tax = shipping_subtotal * 0.07
  end

  def shipping
    self.shipping = 5
  end 



  def total
    if self.promo == nil
      self[:total] = subtotal + shipping + tax
    else
      self[:total] = subtotal + shipping - promo + tax     
    end
  end  


private
  def set_shipping_address

  end

  def set_order_status
    self.order_status_id = 1
  end
  def set_order_user
    self.user_id = user_id
  end  

  def update_subtotal
    self[:subtotal] = subtotal
  end

  def update_total
    self[:total] = total
  end  

end

如果您需要了解更多信息，请与我们联系，我会更新问题。

Answer 1

为了让它以我想要的方式工作，我不得不改变逻辑。所以我将update_promo_code方法移动到了PromoCode模型。我认为这样更干净。

以下是更新后的模型：

<强> promo_code.rb

class PromoCode < ActiveRecord::Base
    belongs_to  :order
    belongs_to  :promo_rule
    before_update :update_promo_code

    def update_promo_code
        if PromoRule.where(["rule_code = ?", self.promo_code]).first
            @promo_rule = PromoRule.where(["rule_code = ?", self.promo_code]).take
        else
            @promo_rule = PromoRule.find(2)
        end

        if self.promo_code == @promo_rule.rule_code
            self.promo_rule = @promo_rule
            self.apply_promo = true
            self.order.update_attribute(:promo, @promo_rule.amount) 

        else
            self.promo_rule = @promo_rule
            self.apply_promo = false
            true
            self.order.update_attribute(:promo, @promo_rule.amount)

        end
    end

end

<强> order.rb

class Order < ActiveRecord::Base
  belongs_to :order_status
  belongs_to :user
  has_many :order_items
  has_many :products, through: :order_items
  has_one :shipping_address, through: :user
  has_one :purchase
  has_one :promo_code
  has_one :promo_rule, through: :promo_code
  before_create :set_order_status
  before_create :set_order_user
  before_save :update_subtotal
  before_save :update_total
  before_update :update_subtotal
  before_update :update_total  
  before_save :tax  
  before_save :shipping
  after_create :create_promo_code


  def create_promo_code
    PromoCode.create(order_id: self.id, apply_promo: false) 
  end


  def subtotal
    order_items.collect { |oi| oi.valid? ? (oi.quantity * oi.unit_price) : 0 }.sum
  end

  def tax
    shipping_subtotal = shipping + subtotal
    self.tax = shipping_subtotal * 0.07
  end

  def shipping
    self.shipping = 5
  end 



  def total
    if self.promo == nil
      self[:total] = subtotal + shipping + tax
    else
      self[:total] = subtotal + shipping - promo + tax     
    end
  end  


private
  def set_shipping_address

  end

  def set_order_status
    self.order_status_id = 1
  end
  def set_order_user
    self.user_id = user_id
  end  

  def update_subtotal
    self[:subtotal] = subtotal
  end

  def update_total
    self[:total] = total
  end  

end