api_params[:order] = @orderby_spec if @orderby_spec
res = $arvados_api_client.api @resource_class, '', api_params
@results = $arvados_api_client.unpack_api_response res
api_params[:order] = @orderby_spec if @orderby_spec
res = $arvados_api_client.api @resource_class, '', api_params
@results = $arvados_api_client.unpack_api_response res