Change attribute names in serialized output - to_xml or to_json


When serializing an object, is there a way to change the name of an
attribute outputted without changing the underlying model (i.e… I do
not want to change model attributes or methods? I have a class that
has an association called materials… I would like the tag generated
when I call to_xml to be vs . Another example
is I have a method called get_url… I would like the tag to be
vs <get_url>…