Question

我已经将大部分功能部件写入了我的业务（无线ISP）的自定义计费系统，但我已经把它自己搞砸了。

以下是基本概述：它是我的客户的定期计费系统，每月自动生成和发送发票给每个客户。但是，我需要允许支票/现金支付，因为我与本地客户打交道，还需要允许预付款，因此我不能只使用Stripe的定期结算。基本上，付款不直接与发票相关联，以允许这类付款。

模型/ invoice.rb

class Invoice < ActiveRecord::Base
  belongs_to :customer
  has_many :line_items
  has_many :invoice_payments
  has_many :payments, through: :invoice_payments

模型/ payment.rb

class Payment < ActiveRecord::Base
  belongs_to :customer

模型/ customer.rb

class Customer < ActiveRecord::Base
  has_many :subscriptions, dependent: :destroy
  has_many :services, through: :subscriptions
  has_many :invoices, :order => 'id DESC'
  has_many :payments

我需要一种方法，可以自动将所有未应用的付款与所有未付款的发票相关联。现在我把它作为def apply_unapplied_payments放在客户模型上，但可能会稍后将其抽象到lib /中的自己的模块中。

这是我迄今为止在模型/ customer.rb

中所做的工作

def apply_unapplied_payments
  unpaid_invoices = invoices.find_by_status("unpaid")
  unapplied_payments = payments.where("invoice_id is null")
  unpaid_invoices.each do |invoice|
    # find the oldest unapplied payment
    # apply payment to this invoice
    # if payment > invoice, keep whatever amount is left and move to next invoice
    # apply leftover amount to invoice, if invoice is still unpaid, move to next unapplied payment
  end
  customer.update_balance
end

有关填写伪代码的建议吗？我对任何级别的重构都持开放态度，所以如果你能想出更好的方法来解决这个问题，请告诉我！

Answer 1

这就是我要做的事情（在付款和发票类中可能需要一些辅助方法）：

def apply_unapplied_payments
  unpaid_invoices = invoices.find_by_status("unpaid")
  unapplied_payments = payments.where("invoice_id is null")
  invoice = unpaid_invoices.shift
  payment = unapplied_payments.shift
  while invoice && invoice.remaining_balance > 0 && payment && payment.remaining_credit > 0
      apply_payment_to_invoice(invoice, payment)
      invoice = unpaid_invoices.shift    if invoice.remaining_balance == 0
      payment = unapplied_payments.shift if payment.remaining_credit  == 0
  end
end

将付款应用于铁路计费系统中的发票

1 个答案: