How to change Rails 3 to_xml encoding - ruby-on-rails

Question

Im using Rails 3 to_xml on a Model with a few options like include, except and methods.
So this is not my first time using to_xml.
I'm doing something like this:
to_xml(include: {
order: {
methods: [:my_avg],
except: [:this_attr, :and_this_attr ]
},
customer: {}
})
The XML result:
<?xml version="1.0" encoding="UTF-8"?>
<my-model>
<attr1 type="integer">12</attr1>
<attr2 type="integer">12</attr2>
<order>
<name>foo</name>
<desc>bar</desc>
<my-avg>
<avg type="integer">123</avg>
<foo>ok</foo>
</my-avg>
</order>
<updated-at type="datetime">2014-04-14T11:16:56-03:00</updated-at>
</my-model>
But now I want to change the xml encoding ISO_8859_1 instead of utf8.
I haven't seen an encoding option on ActiveRecord::Serialization module.
If I simply add one encoding option it creates a XML attribute instead of changing the encoding that results on this XML:
<?xml version="1.0" encoding="UTF-8"?>
<my-model>
<attr1 type="integer" encoding="ISO-8859-1">12</attr1>
<attr2 type="integer" encoding="ISO-8859-1">12</attr2>
<order>
<name>foo</name>
<desc>bar</desc>
<my-avg>
<avg type="integer">123</avg>
<foo>ok</foo>
</my-avg>
</order>
<updated-at type="datetime">2014-04-14T11:16:56-03:00</updated-at>
</my-model>
Is there a way to specify the encoding using ActiveRecord's to_xml?

Answer 1

you may override to_xml in your Model & specify encoding. something like this could work:
class ModelName < ActiveRecord::Base
def to_xml(options = {})
require 'builder'
options[:indent] ||= 2
xml = options[:builder] ||= ::Builder::XmlMarkup.new(indent: options[:indent])
xml.instruct! :xml, :version=>"1.0", :encoding => "ISO-8859-1"
xml.level_one do
xml.tag!(:second_level, 'content')
end
end
end