How to create XML object from string using xml-mapping in Ruby

Question

I'm using xml-mapping in Ruby (on Sinatra) for some XML stuff. Generally I follow this tutorial: http://xml-mapping.rubyforge.org/. I can create objects and write them to XML strings using

login.save_to_xml.to_s

But when I try

login = Login.load_from_xml(xml_string)

I get the following error:

XML::MappingError - no value, and no default value: Attribute username not set (XXPathError: path not found: username):

Here is the XML string I receive:

<login><username>ali</username><password>baba</password></login>

This is what the class looks like:

class Login
  include XML::Mapping

  text_node :username, "username"
  text_node :password, "password"
end

So the class name is the same, the nodes are named the same. I actually get the exact same string when I create an instance of my object and fill it with ali/baba:

test = Login.new
test.username = "ali"
test.password = "baba"
p test.save_to_xml.to_s

<login><username>ali</username><password>baba</password></login>

What am I missing?

Thanks, MrB

EDIT:

When I do

test = login.save_to_xml

And then

login = Login.load_from_xml(test)

it works. So the problem seems to be that I'm passing a string, while the method is expecting.. well, something else. There is definitely a load_from_xml(string) method in the rubydocs, so not sure what to pass here. I guess I need some kind of reverse to_s?

bheeshmar · Accepted Answer · 2011-05-16 21:28:20Z

2

It looks like you save_to_xml creates a REXML::Element. Since that works, you may want to try:

Login.load_from_xml(REXML::Document.new(xml_string).root)

See the section on "choice_node" for a more detailed example http://xml-mapping.rubyforge.org/

answered May 16, 2011 at 21:28

bheeshmar

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