未定义的方法`to_d‘on Heroku

Question

我有一个部署到Heroku的应用程序，当我试图在数据库中创建一个新的Choice时，它会给我以下错误。我使用virtual attributes在应用程序中处理整数形式的钱。它在我自己的机器上工作得很好，但是当部署到Heroku时，to to_d方法失败。原因:)

2012-11-12 09:48:54+00:00 app web.1 - -
2012-11-12 09:48:54+00:00 heroku router - - POST www.mydomain.com/choices dyno=web.1 queue=0 wait=0ms service=68ms status=500 bytes=643
2012-11-12 09:48:54+00:00 app web.1 - -
2012-11-12 09:48:54+00:00 app web.1 - - Started POST "/choices" for 87.60.190.9/x1-6-00-16-cb-c1-a8-b7.k989.webspeed.com at 2012-11-12 09:48:54 +0000
2012-11-12 09:48:54+00:00 app web.1 - -
2012-11-12 09:48:54+00:00 app web.1 - - NoMethodError (undefined method `to_d' for 6600:Fixnum):
2012-11-12 09:48:54+00:00 app web.1 - - app/models/choice.rb:27:in `value_in_currency'
2012-11-12 09:48:54+00:00 app web.1 - - app/controllers/choices_controller.rb:9:in `create'
2012-11-12 09:48:54+00:00 app web.1 - -
2012-11-12 09:48:54+00:00 app web.1 - -
2012-11-12 09:48:54+00:00 app web.1 - - Processing by ChoicesController#create as HTML
2012-11-12 09:48:54+00:00 app web.1 - - Parameters: {"utf8"=>"✓", "authenticity_token"=>"YygjksxB+1SXnJ8j4jvTtxnh2JfJELpCeHysGrvItcU=", "choice"=>{"spotarea_id"=>"1", "product_id"=>"1", "value_in_currency"=>"66", "exposure"=>"80", "deliverydate"=>"2012-11-13"}, "commit"=>"Create Choice"}
2012-11-12 09:48:54+00:00 app web.1 - - Completed 500 Internal Server Error in 38ms

我的Choice模型包含以下内容：

class Choice < ActiveRecord::Base
  belongs_to :user
  belongs_to :spotarea
  belongs_to :product
  has_many   :bets,       :dependent => :destroy

  attr_accessible     :deliverydate, :exposure, :value_in_currency, :user_id, :spotarea_id, :product_id
  attr_accessible     :deliverydate, :exposure, :value_in_currency, :user_id, :spotarea_id, :product_id, as: :admin

  # Validations
  validates   :spotarea, :product, :value_in_currency, :exposure, :presence => { :message => "is missing!" }
  validates   :value_in_currency, :exposure, :numericality => { :message => "is not numeric!" }
  validates   :value_in_currency, :format => { :with => /^\d+\.?\d{0,2}$/, :message => "is not correctly formatted!" }

  def value_in_currency
    value.to_d/100 if value?
  end

  def value_in_currency=(currency)
    self.value = currency.to_d*100 if currency.present?
  end
end

编辑：

我想我找到了一个解决方案。我重写了代码，因此它现在包含以下内容。我还是不明白为什么to_d不能工作。

def value_in_currency
  BigDecimal(value.to_s)/100 if value?
end

def value_in_currency=(currency)
  self.value = BigDecimal(currency.to_s)*100 if currency.present?
end

Answer 1

我想我找到了一个解决方案。我重写了代码，因此它现在包含以下内容。我还是不明白为什么to_d不能工作。

def value_in_currency
  BigDecimal(value.to_s)/100 if value?  
end

def value_in_currency=(currency)
  self.value = BigDecimal(currency.to_s)*100 if currency.present?
end