RestKit RequestDescriptor Mappings

-(RKRequestDescriptor *)getMetricsRequestDescriptor

{

    RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];

    [requestMapping addAttributeMappingsFromArray:@[@"Id", @"Type",@"tok", @"CmID"]];

    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[class_metrics_param class] rootKeyPath:nil method:RKRequestMethodPOST];

    return requestDescriptor;

}