def edit(self, resource):
        """Edit a config.

        :param resource: :class:`configs.Config <configs.Config>` object
        :return: :class:`configs.Config <configs.Config>` object
        :rtype: configs.Config
        """
        schema = self.EDIT_SCHEMA
        json = self.service.encode(schema, resource)

        schema = self.GET_SCHEMA
        resp = self.service.edit(self.base, resource.id, json)
        return self.service.decode(schema, resp)