Ruby on rails 货币可以'；不要被强迫浮动

我有一行代码引起头痛

@amount = Currency.convert(current_user.currency, "USD", transaction.amount)

它会带来这样的错误

Currency can't be coerced into Float

应用程序跟踪如下所示

app/models/currency.rb:8:in `*'
app/models/currency.rb:8:in `convert'
app/controllers/paypal_controller.rb:35:in `create'

class Currency < ActiveRecord::Base
  attr_accessible :currency, :value

      def self.convert(from,to,amount)
        from_rate = Currency.find_by_currency(from)
        to_rate = Currency.find_by_currency(to)
        usd_value  = (amount/(from_rate.value.to_f))
        result = (usd_value.to_f * (to_rate.value.to_f))        
        return result
      end
end

其中

Currency.convert

模型方法如下所示

  def self.convert(from,to,amount)
    from_rate = Currency.find_by_currency(from)
    to_rate = Currency.find_by_currency(to)
    usd = (amount/(from_rate.value.to_f))
    result = (usd*(to_rate.value.to_f))     
    return result
  end

可能是什么错误

在控制台中运行

def convert(from,to,amount)
    from_rate = Currency.find_by_currency(from)
    to_rate = Currency.find_by_currency(to)
    usd = (amount/(from_rate.value.to_f))
    result = (usd*(to_rate.value.to_f))     
    return result
  end

然后,

转换（“UGX”，“KES”，2000）。到四舍五入（0

）

工作

货币模型如下所示

app/models/currency.rb:8:in `*'
app/models/currency.rb:8:in `convert'
app/controllers/paypal_controller.rb:35:in `create'

class Currency < ActiveRecord::Base
  attr_accessible :currency, :value

      def self.convert(from,to,amount)
        from_rate = Currency.find_by_currency(from)
        to_rate = Currency.find_by_currency(to)
        usd_value  = (amount/(from_rate.value.to_f))
        result = (usd_value.to_f * (to_rate.value.to_f))        
        return result
      end
end

class Currency

大概是这一行的问题-

结果=（usd*to_rate.value）

。如果您将其重写为result=（usd*（to_rate.value））`如果您将

打印到_rate.value

，您会得到什么？usd和

to_rate.value

的类别是什么？当您不期望时，其中一个可能是

Currency

对象。@Teeg这些只是在方法中分配的变量。@user2963716-您能为我们提供货币模型的完整代码吗？或者至少是行号？@Chandranshu，我加上了。看一看。