class Invoker(object):

    def __init__(self, **args):
        pass

    # Method for handline pre save semantics
    #      content here would be model specific but could include handling Many-to-Many relationship
    #      creation - which must occur post save
    #
    # obj     - Whatever obj was just saved
    # returns - None - this is a pure invoke() call, return type is None
    #
    def presave(self, obj):
        return None


    # Method for handline post save semantics
    #      content here would be model specific but could include handling Many-to-Many relationship
    #      creation - which must occur post save
    #
    # obj     - Whatever obj was just saved
    # returns - None - this is a pure invoke() call, return type is None
    #
    def postsave(self, obj):
        return None