'Update a single project quota data.
The PATCH data should be an application/json object with the
attributes to set to new quota values.
This method returns HTTP 204 (no content) on success.'

@rest_utils.ajax(data_required=True)
def patch(self, request, project_id):

    disabled_quotas = quotas.get_disabled_quotas(request)
    if api.cinder.is_volume_service_enabled(request):
        cinder_data = {key: request.DATA[key] for key in quotas.CINDER_QUOTA_FIELDS if (key not in disabled_quotas)}
        api.cinder.tenant_quota_update(request, project_id, **cinder_data)
    else:
        raise rest_utils.AjaxError(501, _('Service    Cinder    is    disabled.'))
