获得欧洲日期格式（dd / mm / yyyy） [英] Getting rails to accept European date format (dd/mm/yyyy)

问题描述

在我的模型中，我尝试将日期转换为我认为Rails将调用的Date.parse方法的美国标准是期待：

  before_validation：check_due_at_format 
 
 def check_due_at_format 
 self.due_at = Date.strptime（self.due_at，％d /％m /％Y）to_time 
 end 
  

然而，这返回：

  TypeError在OrdersController＃update 
不能dup NilClass 
  

如果知道有用，项目表单字段在订单中嵌套，订单设置为：

  acceptable_nested_attributes_for：items，：reject_if => lambda {| a | a [：quantity] .blank？ &&&一个[：due_at] .blank？ }，：allow_destroy => ：true 
  

所以这些项目在@ order.save / @订单上被验证并保存/更新。 update_attributes

谢谢！

解决方案

可能只是一个例子的 due_at 值为零。在你的情况下，这是一个空字符串，但是由于 acceptance_nested_attributes_for 上的：reject_if 选项被忽略，所以它仍然是

 >> Date.strptime（nil，％d /％m /％Y）
 TypeError：不能重复NilClass 
  

然后用一些条件来处理它。

  self.due_at = Date.strptime（self。 due_at，％d /％m /％Y）。to_time除非self.due_at.nil？ 
  

I want my rails app to accept dates for a date field in the format dd/mm/yyyy.

In my model I have tried to convert the date to the American standard which I think the Date.parse method that Rails will call on it is expecting:

  before_validation :check_due_at_format

  def check_due_at_format
    self.due_at = Date.strptime(self.due_at,"%d/%m/%Y").to_time
  end

However, this returns:

TypeError in OrdersController#update
can't dup NilClass

If it is useful to know, the Items form fields are a nested for within Orders, and Orders are set to:

  accepts_nested_attributes_for :items, :reject_if => lambda { |a| a[:quantity].blank? && a[:due_at].blank? }, :allow_destroy => :true

So the items are being validated and saved/updated on @order.save/@order.update_attributes

Thank you!

解决方案

It may be just a case of the due_at value being nil. In your case it's an empty string, but ignored because of the :reject_if option on accepts_nested_attributes_for, and so it remains as nil.

>> Date.strptime(nil, "%d/%m/%Y")
TypeError: can't dup NilClass

Take care of it with some conditional then.

self.due_at = Date.strptime(self.due_at,"%d/%m/%Y").to_time unless self.due_at.nil?

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