Ruby on Rails - how to render as xml models with has_many associations -

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Has_many 'Association with sub_tests is thus in the show method for the list. 

  response_to do | Format | Format.html # show.html.erb format.xml {Render: xml = & gt; @ltest} end

Although it provides the ltest object, subtitles related to ltest do not render.

How can I do this? 

  & lt; Ltest & gt; .... & lt; Sub_test & gt; ... & lt; / Sub_test & gt; & Lt; Sub_test & gt; ... & lt; / Sub_test & gt; & Lt; / Ltest & gt;

I tried to present it using a sequence like this:

But it creates two xml documents instead of subtitests with one instead of one ltests Embedded in

Any suggestions on how I can do this?

You do not have to use builder or ARB for this. You can get whatever you want in the controller (at least I run the train 2.3.4). Like: 

  format.xml {render: xml = & gt; @ Ltest.to_xml (: included = & gt;: sub_tests)}

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