How do I convert a Ruby hash to XML?

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Here is the specific XML I ultimately need:

<?xml version="1.0" encoding="UTF-8"?>
<customer>
  <email>joe@example.com</email>
  <first_name>Joe</first_name>
  <last_name>Blow</last_name>
</customer>

But say I have a controller (Ruby on Rails) that is sending the data to a method. I'd prefer to send it as a hash, like so:

:first_name => 'Joe',
:last_name => 'Blow',
:email => 'joe@example.com'

So, how can I convert the hash to that XML format?

5 Answers

Gem gyoku very nice.

Gyoku.xml(:lower_camel_case => "key")    
# => "<lowerCamelCase>key</lowerCamelCase>"

Gyoku.xml({ :camel_case => "key" }, { :key_converter => :camelcase })
# => "<CamelCase>key</CamelCase>"

Gyoku.xml({ acronym_abc: "value" }, key_converter: lambda { |key| key.camelize(:lower) })
# => "<acronymABC>value</acronymABC>"

and more useful options.

I did a short presentation about exactly that topic at my university a while back. Here are the slides (Interesting part starts at >= page 37)

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