ruby-on-rails - 触发 rails controller 功能 - Paypal Website Standard IPN

Question

我有一个 Paypal IPN 进入我的应用程序中的 PaymentNotificationsController。但是，一些变量取决于购物车中的商品数量，因此我想在创建 PaymentNotification 之前提取它们。

到目前为止，我有:

class PaymentNotificationsController < ApplicationController
  protect_from_forgery except: [:create]
     def create
       PaymentNotification.create!(params: params, 
       item_number: params[:item_number], item_name: params[:item_name], quantity: params[:quantity] 
       render nothing: true
     end
end

但是，当通知来自 PayPal 时，它以 item_name1, item_number1, quantity1, item_name2, item_number2, quantity2 等形式出现。即使它只是一个项目，它也会以 item_name1、item_number1、quantity1、option1 等形式出现。

我有这个函数来尝试提取变量，但我不知道如何触发该函数。我尝试在 Controller 顶部使用 before_action 但它不起作用。返回的参数数量错误(1 为 0):

ITEM_PARAM_PREFIXES = ["item_name", "item_number", "quantity"]

def extract_ipn_items_params(params)
  item_params = []

  loop do
    item_num_to_test = item_params.length + 1
    item_num_suffix = item_num_to_test.to_s
    possible_param_name = ITEM_PARAM_PREFIXES[0] + item_num_suffix
    if params.include?(possible_param_name)
      this_item_params = {}
      ITEM_PARAM_PREFIXES.each do |prefix|
        this_item_params[prefix] = params[prefix + item_num_suffix]
      end
      item_params.push this_item_params
    else
      return item_params
    end
  end
end

所以我想问，我如何触发函数来提取变量并将它们放入购物车中每个项目的 params[:item_number]、params[:item_name]、params[:quantity] 中，如果有两个项目，将创建两个单独的 PaymentNotifications？

注意:这两种方法都在同一个PaymentNotificationsController中。

如有任何帮助，我们将不胜感激。提前致谢!

Answer 1

我假设你的方法 extract_ipn_items_params 已经获取了你需要的数据，你可以删除方法的 params 参数，因为参数总是在 actions/methods 中可用 Controller 。

ITEM_PARAM_PREFIXES = ["item_name", "item_number", "quantity"]

def extract_ipn_items_params
    mod_params = Hash.new{|k, v| k[v] = {} }

    ITEM_PARAM_PREFIXES.each do |item_data_key|
        key_tracker = 1
        loop do
            current_key = (item_data_key + key_tracker.to_s).to_sym
            if params.include? current_key
                mod_params[key_tracker][item_data_key] = params[current_key]
            else
                break
            end
            key_tracker += 1
        end
    end
    mod_params
end

该方法返回一个散列的散列，例如:

{1 => {item_name: 'Item 1', item_number: 1084, quantity: 15}}，如果你为用户设置了嵌套属性，我想你应该可以做一些类似的事情，不太确定，但应该是可能的:

user.update(payment_notifications_attributes: extract_ipn_items_params)

让我知道这是否适合您。

更新

基于 Github Gist，这是我能够想出的一些东西:

class PaymentNotificationsController < ApplicationController
  protect_from_forgery except: [:create]

  ITEM_PARAM_PREFIXES = ["item_name", "item_number", "quantity", "option_name"]


   def create
    extract_ipn_items_params.each do |key, values|
      # this approach loops through all the returned results, nested attributes may help abstract this though
        PaymentNotification.create(values)  
        render nothing: true
    end

  def details
    # params.extract_ipn_items_params #this doesn't exist as params is an instance of ActionController::Parameters
    PaymentNotification.update_attributes(line_item_id: params[:item_number], product_title: params[:item_name], option_name: params[:option_name], quantity: params[:quantity])
  end

  private

    def additional_attributes
      # create this for additional merge attributes. A better place for these would be the parent of this
      {
        params: params, 
        cart_id: params[:invoice], 
        status: params[:payment_status], 
        transaction_id: params[:txn_id], 
        first_name: params[:first_name], 
        last_name: params[:last_name], 
        email: params[:payer_email], 
        address_name: params[:address_name], 
        address_street: params[:address_street], 
        address_city: params[:address_city], 
        address_state: params[:address_state], 
        address_zip: params[:address_zip], 
        address_country: params[:address_country]
      }
    end

    def extract_ipn_items_params
      mod_params = Hash.new{|k, v| k[v] = {}.merge(additional_attributes) }

      ITEM_PARAM_PREFIXES.each do |item_data_key|
          key_tracker = 1
          loop do
              current_key = (item_data_key + key_tracker.to_s).to_sym
              if params.include? current_key
                  mod_params[key_tracker][item_data_key] = params[current_key]
              else
                  break
              end
              key_tracker += 1
          end
      end
      mod_params
    end

end

如果这能解决您的问题，请告诉我。