gistfile1.rb

#!/usr/bin/env ruby
require 'active_support/core_ext' #in-built with standard Ruby on Rails libraries
require 'json' #same as above
require 'json/stream' #command line: gem install json-stream
require 'open-uri' #open the stream

def convert_to_XML(input_file, output_file, type_of_feed)
	stream = File.open input_file #takes the input from the input_file
	json = JSON::Stream::Parser.parse(stream) #special magic to make the JSON stream instead of 1 big file into memory
	xml = json.to_xml(:root => type_of_feed) #resultant XML file to write out

	to_file = File.open(output_file, 'w+') {
		|file|
		file.write(xml)
	}
end

def from_JSON_to_XML(input_url, output_file, type_of_feed)
	stream = open(input_url).read #takes the input from a URL stream
	json = JSON::Stream::Parser.parse(stream) #special magic to make JSON stream instead of 1 big net feed
	xml = json.to_xml(:root => type_of_feed)

	to_file = File.open(output_file, 'w+') {
		|file|
		file.write(xml)
	}
end

convert_to_XML('sample-soccer.json', 'soccer.xml','soccer')
from_JSON_to_XML('http://www.example.com/api/feed/competitors?event_id=2319508', 'competitors.xml', 'horsies')