Ruby:使用哈希跟踪股票交易

Question

我是Ruby的新手，我正在尝试编写一个"简单"的系统，以便跟踪股票交易。计算平均价格，在未来我会尝试获得股息信息。

到目前为止，我的代码是这样的（请随意提出更好的方法来完成我的代码，正如我所说，我是新手）。

require 'money'
require 'money/bank/google_currency'
require 'monetize'
require 'date'
require 'ystock'
require 'ostruct'
# (optional)
# set the seconds after than the current rates are automatically expired
# by default, they never expire
Money::Bank::GoogleCurrency.ttl_in_seconds = 86400
I18n.enforce_available_locales = false #erro no formatting...
# set default bank to instance of GoogleCurrency
Money.default_bank = Money::Bank::GoogleCurrency.new
class Stock
attr_accessor :code, :quantity, :price, :transactions, :spotprice
    def initialize(code:)
        @code = code
        @quantity =00
        @price = 00.to_money(:BRL)
        @transactions = []
        @spotprice = 0.to_money(:BRL)
    end    
    def spotprice
        begin
            asset_temp = Ystock.quote(@code.to_s + ".sa") # since it is South America.
            asset_info = OpenStruct.new asset_temp # organize it.
            @spotprice = asset_info.price.to_money(:BRL) # get the price. And transform it to Money, local currency
        rescue => @error #Is there an TCP/IP error?
            @spotprice = 0.to_money(:BRL)
        end
    end
    def buy (quantity:, price:, fees:, date:0)
        transactions.push type: "BUY", date: Date.strptime(date.to_s, '%d/%m/%Y'), quantity: quantity, price: price.to_money(:BRL), fees: fees.to_money(:BRL)
        #Lets calculate the average price that we bought:
        new_price = (((@quantity * @price.to_money(:BRL))) + ((quantity * price.to_money(:BRL)) + fees.to_money(:BRL))) / (@quantity + quantity)
        @quantity += quantity
        @price = new_price.to_money(:BRL) # new price is the average price.
    end
    def sell (quantity:,price:, fees:, date:)
        transactions.push type: "SELL", date: Date.strptime(date.to_s,     '%d/%m/%Y'), quantity: quantity, price: price.to_money(:BRL), fees:     fees.to_money(:BRL)
        @quantity -= quantity
    end
end

例如，我可以创建资产，并进行买卖：

ciel3 = Stock.new(code: "CIEL3")
ciel3.buy(quantity: 100, price: 9.00, fees: 21.5, date: "12/05/2015")
 p ciel3
ciel3.buy(quantity: 100,price: 12, fees: 21.7, date: "12/06/2015")
ciel3.sell(quantity: 50,price: 11.5,fees: 20.86, date: "20/06/2015")
p ciel3
ciel3.buy(quantity: 200,price: 15,fees: 23.6, date: "12/07/2015")
puts ciel3.price.format
puts
puts
# puts ciel3.spotprice.format
p ciel3.transactions 

到目前为止，还可以（但我认为有一种更干净、更可读的方法……不确定）。

但假设我想查看所有类型为"SELL"的事务。我该怎么做？如何查看具有hash:type的ciel3.transaction数组内部？？Tnks

Answer 1

您可能想要一个Transaction类，而不是使用哈希。

如果您用DB支持它并使用ActiveRecord，那么搜索将非常简单。

如果没有，您可以执行ciel3.transactions.select{|t| t[:type] == 'SELL'}

Answer 2

我用Ruby编写了一个简单的命令行库存管理应用程序。您可能可以为您的项目重用大量代码。

它在我的GitHub上：https://github.com/brunofacca/udacity-inventory-manager