ruby to_xml set root attributes - ruby-on-rails

Question

I need to convert a ruby hash to xml. Here is the hash:
hash = {
"AffiliateInfo" => {
"Username" => '123456',
"Password" => "Mypass",
"TrackingCampaign" => "MyTrackingCampaign",
"Env" => "production"
}
}
and the xml I wanted to generate:
<?xml version="1.0" encoding="UTF-8"?>
<InsuranceRequest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<AffiliateInfo>
<Username>12696</Username>
<Password>MyPassword</Password>
<TrackingCampaign>MyTrackingCampaign</TrackingCampaign>
<LeadSourceID>SourceID</LeadSourceID>
<ProductionEnvironment>true</ProductionEnvironment>
</AffiliateInfo>
</InsuranceRequest>
When I do:
hash.to_xml(root: 'InsuranceRequest')
I get the following xml output
<?xml version="1.0" encoding="UTF-8"?>
<InsuranceRequest>
<AffiliateInfo>
<Username>123456</Username>
<Password>Mypass</Password>
<TrackingCampaign>MyTrackingCampaign</TrackingCampaign>
<Env>production</Env>
</AffiliateInfo>
</InsuranceRequest>
The output is missing the properties of the root node attributes:
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
I cannot add attributes to the root node. Is there a way to add these attributes using to_xml method?
Please suggest if there is any other means to solve my problem.

Answer 1

You need to use custom builder. Here is example with Nokogiri builder
require 'nokogiri'
hash = {"AffiliateInfo" => {
"Username" => '123456',
"Password" => "Mypass",
"TrackingCampaign" => "MyTrackingCampaign",
"Env" => "production"
}
}
builder = Nokogiri::XML::Builder.new do |xml|
xml.InsuranceRequest('xmlns:xsi' => 'http://www.w3.org/2001/XMLSchema-instance', 'xmlns:xsd' => 'http://www.w3.org/2001/XMLSchema') do
xml.AffiliateInfo do
hash['AffiliateInfo'].each do |k, v|
xml.send(k, v)
end
end
end
end
builder.to_xml
This produces the following XML document
<?xml version="1.0"?>
<InsuranceRequest
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<AffiliateInfo>
<Username>123456</Username>
<Password>Mypass</Password>
<TrackingCampaign>MyTrackingCampaign</TrackingCampaign>
<Env>production</Env>
</AffiliateInfo>
</InsuranceRequest>
Please note that hash should be defined before builder
Here is Nokogiri documentation http://www.rubydoc.info/github/sparklemotion/nokogiri/Nokogiri/XML/Builder