Namespace attributes in Builder gem

Question

Im trying to build out this sample in a Ruby on Rails app with the builder gem:

<?xml version="1.0" encoding="utf-8"?> 
<ngp:contactGet xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ngp="http://www.ngpsoftware.com/ngpapi"> 
<campaignID>1033</campaignID> 
<contactID>199434</contactID> 
</ngp:contactGet>

I can generate a tag with a namespace as follows:

xml = Builder::XmlMarkup.new
xml.ngp :contactGet

...but I can't get an attribute inside that tag.

I would think that

xml.ngp :contactGet("xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance" "xmlns:ngp" =>"http://www.ngpsoftware.com/ngpapi"

would work but it doesn't.

Please Help!

Answer 1

Figured it out:

xml.tag!('gp:contactGet', {"xmlns:xsi"=>"http://www.w3.org/2001/XMLSchema-instance", "xmlns:ngp"=>"http://www.ngpsoftware.com/ngpapi"}) do 
  xml.campaignID("1033")
  xml.contactID("199434")
end

Produces...

<?xml version="1.0" encoding="UTF-8"?>
<gp:contactGet xmlns:ngp="http://www.ngpsoftware.com/ngpapi" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <campaignID>1033</campaignID>
  <contactID>199434</contactID>
</gp:contactGet><to_s/>

Answer 2

From Builder's doc: http://builder.rubyforge.org/

Some support for XML namespaces is now available. If the first argument to a tag call is a symbol, it will be joined to the tag to produce a namespace:tag combination. It is easier to show this than describe it.

xml.SOAP :Envelope do ... end

Just put a space before the colon in a namespace to produce the right form for builder (e.g. "SOAP:Envelope" => "xml.SOAP :Envelope")

So, you can write like this:

xml.gp :contactGet do
  xml.campaignID("1033")
  xml.contactID("199434")
end