'Returns the Field in the \'to\' object to which this relationship is
tied.'

def get_related_field(self):

    data = self.to._meta.get_field_by_name(self.field_name)
    if (not data[2]):
        raise FieldDoesNotExist(("No    related    field    named    '%s'" % self.field_name))
    return data[0]
