XML序列化不包括Rails的模型，日期时间字段毫秒 [英] XML Serialization is not including milliseconds in datetime field from Rails model

问题描述

在默认情况下，从数据库中的时间字段被转换并剥离毫秒：

By default, the datetime field from the database is being converted and stripping off the milliseconds:

some_datetime =>2009-11-11T02：19：36Z

some_datetime => "2009-11-11T02:19:36Z"

attribute_before_type_cast（'some_datetime'）=>2009-11-11 02：19：36.145

attribute_before_type_cast('some_datetime') => "2009-11-11 02:19:36.145"

如果我尝试overrride的访问此属性等等;

If I try to overrride the accessor for this attribute like;

def some_datetime
  attribute_before_type_cast('some_datetime')
end

当我尝试to_xml为模式，我得到以下错误：

when I try "to_xml" for that model, I get the following error:

NoMethodError（未定义的方法   `XMLSCHEMA为2009-11-11   02：19：36.145：字符串）：

NoMethodError (undefined method `xmlschema' for "2009-11-11 02:19:36.145":String):

我试图解析字符串到一个Time对象，但不能得到一个包含毫秒;

I have tried to parse the String to a Time object but can't get one to include the milliseconds;

  def some_datetime
    Time.parse(attribute_before_type_cast('some_datetime').sub(/\s/,"T").sub(/$/,"Z"))
  end

谁能帮助获得获得日期时间与to_xml呈现毫秒？

Can anyone help get get a datetime with milliseconds rendered by to_xml?

推荐答案

事实证明，我可以排除原始日期时间字段，并添加自定义的方法，从而使该日期时间为一个字符串to_xml。这种感觉的hackish，但它的工作..有另一种方式来直接获得毫秒原始日期时间字段？

As it turns out, I can exclude the original datetime field, and add a custom method which in turn renders the datetime as a string to the to_xml. This feels hackish, but it's working.. Is there another way to get milliseconds directly in the original datetime field?

在每一个模型，我排除除了有，我想改变日期时间字段名称，和我有相同名称返回属性，它是类型强制转换前的方法。

In each model, I exclude "except" the field names that have datetimes that I want changed, and I include "methods" with the same name returning the attribute before it is typecasted.

  def to_xml(options = {})
    options[:methods] = [:some_datetime]
    options[:except] = [:some_datetime]
    super
  end

  def some_datetime
    attribute_before_type_cast('some_datetime')
  end

渲染to_xml是伟大的工作与模型包括与任何其他选项我通过在

Rendering to_xml is working great with models included and any other options I pass in.

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