具有重复相同节点的 Ruby to_xml

Question

我想生成类似的东西：

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<Test>
  <Car>
    <engine>A</engine>
    <wheels>4</wheels>
  </Car>
  <Car>
    <engine>B</engine>
    <wheels>2</wheels>
  </Car>
</Test>

但是做：

{"Car"=>[{"engine"=>"A", "wheels"=>"4"}, {"engine"=>"B", "wheels"=>"2"}]}.to_xml(:root => "Test")

返回：

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<Test>
  <Car type=\"array\">
    <Car>
      <engine>A</engine>
      <wheels>4</wheels>
    </Car>
    <Car>
      <engine>B</engine>
      <wheels>2</wheels>
    </Car>
  </Car>
</Test>

你看，我不想要父节点"<Car type=\"array\">" 知道如何实现这一目标吗？

谢谢！

Answer 1

对于这个简单的案例，您可以像这样使用Array#to_xml

values = {"Car"=>[{"engine"=>"A", "wheels"=>"4"}, {"engine"=>"B","wheels"=>"2"}]}.values.pop
#=> [{"engine"=>"A", "wheels"=>"4"}, {"engine"=>"B", "wheels"=>"2"}]
values.to_xml(:root => "Test", skip_types: true, children: "Car")
#=>"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Test>\n  <Car>\n    <engine>A</engine>\n    <wheels>4</wheels>\n  </Car>\n  <Car>\n    <engine>B</engine>\n    <wheels>2</wheels>\n  </Car>\n</Test>\n"

更简洁

{"Car"=>[{"engine"=>"A", "wheels"=>"4"}, {"engine"=>"B", "wheels"=>"2"}]}.values.pop.to_xml(:root => "Test", skip_types: true, children: "Car")

会回来

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<Test>
  <Car>
    <engine>A</engine>
    <wheels>4</wheels>
  </Car>
  <Car>
    <engine>B</engine>
    <wheels>2</wheels>
  </Car>
</Test>

Array#to_xml 允许您传入root 和children 选项，以便您可以根据要求将root 命名为“测试”和children“汽车”。如果这只是一个示例并且情况更复杂，那么可能会对此感到担忧，在这种情况下，我建议您查看builder，它可以让您对节点及其命名约定进行极大的控制。

Answer 2

How about utilizing the :skip_types => true option?

{"Car"=>[{"engine"=>"A", "wheels"=>"4"}, {"engine"=>"B", "wheels"=>"2"}]}.to_xml(:root => "Test", :skip_types => true)