value_nesting.py

class UserValue(ValueComposite):

    def __init__(self, user):
        super(UserValue, self).initialize({})

        self.serialize_with(username=user.username)
        self.serialize_with(email=user.email)
        self.serialize_with(first_name=user.first_name)
        self.serialize_with(last_name=user.last_name)

class EditorValue(ValueComposite):

    def __init__(self, editor):
        super(EditorValue, self).initialize({})

        self.serialize_with(number_of_lps=editor.number_of_lps)
        self.serialize_with(average_rating=editor.average_rating)

class ProfileValue(ValueComposite):

    def __init__(self, user_value, editor_value):
        super(ProfileValue, self).initialize({})

        self.serialize_from_value(user_value)
        self.serialize_from_value(editor_value)