ruby-on-rails - 覆盖 to_xml 以收集 ActiveRecord 对象

Question

好的，我知道您可以为 ActiveRecord 对象的单个实例覆盖 to_xml 方法，它对我来说工作得很好。但是我将如何着手覆盖对象集合的 to_xml 方法？

假设对于任务模型实例，我实现了如下所示的 to_xml。

def to_xml
  super(:methods => [:tag_list], :include => {:project => {:include => {:folder => {}}}, :folder => {}})
end

当单个任务被序列化为 xml 时工作得很好。但是当我的代码运行收集任务时，如下面的代码

render :xml => @tasks.to_xml

我明白了

wrong number of arguments (1 for 0)

/home/chirantan/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/array/conversions.rb:189:in `to_xml'
/home/chirantan/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/array/conversions.rb:189:in `to_xml'
/home/chirantan/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/array/conversions.rb:189:in `each'
/home/chirantan/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/array/conversions.rb:189:in `to_xml'
/var/lib/gems/1.8/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `call'
/var/lib/gems/1.8/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `_nested_structures'
/var/lib/gems/1.8/gems/builder-2.1.2/lib/builder/xmlbase.rb:58:in `method_missing'
/var/lib/gems/1.8/gems/builder-2.1.2/lib/builder/xmlbase.rb:31:in `tag!'
/~/blah/app/controllers/tasks_controller.rb:412:in `completed'

我如何使它工作？

Answer 1

应该声明您的 to_xml 覆盖

def to_xml options={}
   ....
end