gistfile1.txt

    def get_meta_property(self, name):
        if not self.has_property(name):
            msg = "Invalid metadata field '{0}'".format(name)
            raise InvalidMetadataField(msg)
        try:
            value_obj = self.meta_values.get(category__name=name)
        except NodeMetadataValue.DoesNotExist:
            return None

        return value_obj.value

        return None