POST JSON to Server from CoreData Information - ios

Question

I'm somewhat new to iOS development so I'm trying to figure out posting a JSON string to a webserver and getting back some information. In the first page I ask for the user to give me their first name and last name. I then generate an ID for them and pass them to the second page. When the second page loads I want to send a JSON string to the server to tell it the users first name, last name among other things. The request would be like follows:
{
"user":{
"first_name":"Joe",
"last_name":"User",
"device_descriptor":"iPhone",
"idfa":"12345678",
"btmacid":"01:23:45:67:89:ab"
}
}
The create response successful would come back as follows:
{
"id": "8",
"first_name: "Joe",
"last_name": "User",
"device_descriptor": "iPhone",
"created_at": "2014-10-07T05:25:36.119Z",
"updated_at": "2014-10-07T05:25:36.119Z",
"idfa": "12345678",
"btmacid": "01:23:45:67:89:ab"
}
The code I have thus far is as follows:
#import "WelcomeViewController.h"
#import "CoreDataStack.h"
#import "UserInformation.h"
#import <CoreData/CoreData.h>
#import <RestKit/RestKit.h>
#interface WelcomeViewController ()
#property (nonatomic,strong) NSFetchedResultsController *fetchResultsController;
#property (strong, nonatomic) IBOutlet UILabel *welcomeTextLabel;
#end
#implementation WelcomeViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.fetchResultsController performFetch:nil];
UserInformation *entry = [[self.fetchResultsController fetchedObjects] objectAtIndex:0];
_welcomeTextLabel.text = [NSString stringWithFormat: #"Welcome " #"%#!", entry.firstName];
[self postUserInformation];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSFetchRequest *)entryFetchRequest{
NSFetchRequest *fetchReqeust = [NSFetchRequest fetchRequestWithEntityName:#"UserInformation"];
fetchReqeust.sortDescriptors = #[[NSSortDescriptor sortDescriptorWithKey:#"createdAt" ascending:NO]];
return fetchReqeust;
}
- (NSFetchedResultsController *)fetchResultsController {
if (_fetchResultsController != nil) {
return _fetchResultsController;
}
CoreDataStack *coreDataStack = [CoreDataStack defaultStack];
NSFetchRequest *fetchRequest = [self entryFetchRequest];
_fetchResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:coreDataStack.managedObjectContext sectionNameKeyPath:nil cacheName:nil];
return _fetchResultsController;
}
- (void) postUserInformation {
[AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
[self.fetchResultsController performFetch:nil];
UserInformation *entry = [[self.fetchResultsController fetchedObjects] objectAtIndex:0];
RKObjectManager *manager = [RKObjectManager sharedManager];
RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[UserInformation class]];
NSDictionary *userInformation = #{
#"id" : #"userID",
#"first_name" : #"firstName",
#"last_name" : #"lastName",
#"device_descriptor" : #"deviceHardwareID",
#"created_at" : #"created_at",
#"updated_at" : #"updated_at",
#"idfa" : #"deviceAdvertisementID",
#"btmacid" : #"btmac_Id"
};
[responseMapping addAttributeMappingsFromDictionary:userInformation];
manager.requestSerializationMIMEType = RKMIMETypeJSON;
NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful);
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping method:RKRequestMethodAny pathPattern:#"/users" keyPath:nil statusCodes:statusCodes];
RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];
[requestMapping addAttributeMappingsFromDictionary:userInformation];
RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[userInformation class] rootKeyPath:nil method:RKRequestMethodAny];
[manager addResponseDescriptor:responseDescriptor];
[manager addRequestDescriptor:requestDescriptor];
// NSDictionary *params = #{
// #"id" : entry.userID,
// #"first_name" : entry.firstName,
// #"last_name" : entry.lastName,
// #"device_descriptor" : entry.deviceHardwareID,
// #"created_at" : entry.createdAt,
// #"updated_at" : entry.updatedAt,
// #"idfa" : entry.deviceAdvertisementID,
// #"btmacid" : entry.btmacID
// };
[manager postObject:userInformation path:#"http://serverendpoint.com/users" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
NSLog(#"Success");
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(#"Failure: %#", error);
}];
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
Any help you all could provide would be greatly appreciated.

Answer 1

You shouldn't create the request mapping with
[requestMapping addAttributeMappingsFromDictionary:userInformation];
Because the inputs and outputs are the wrong way around. Instead, use the inverseMapping from your response mapping.