Adding query string to a url

gistfile1.rb

>> callback = Addressable::URI.parse("http://unni.com")
=> #<Addressable::URI:0x810ab0b4 URI:http://unni.com>
>> callback.query_values = callback.query_values ? callback.query_values.merge({"angry" => "birds"}) : {"angry" => "birds"}
=> {"angry"=>"birds"}
>> callback.to_s
=> "http://unni.com?angry=birds"

>> callback = Addressable::URI.parse("http://unni.com?nikhil=krishna")
=> #<Addressable::URI:0x8109fc8c URI:http://unni.com?nikhil=krishna>
>> callback.query_values = callback.query_values ? callback.query_values.merge({"angry" => "birds"}) : {"angry" => "birds"}
=> {"angry"=>"birds", "nikhil"=>"krishna"}
>> callback.to_s
=> "http://unni.com?angry=birds&nikhil=krishna"