Mapping a simple string with RestKit

Question

I'm trying to read a simple json string response from a web service :

Suppose I have this mapping :

RKObjectMapping* loginRequestMapping = [RKObjectMapping requestMapping];
[loginRequestMapping addAttributeMappingsFromDictionary:@{
 @"userName" : @"UserName",
 @"password" : @"Password"
 }];
RKRequestDescriptor* loginReq = [RKRequestDescriptor requestDescriptorWithMapping:loginRequestMapping objectClass:[LoginRequest class] rootKeyPath:nil method:RKRequestMethodPOST];
[objectManager addRequestDescriptor:loginReq];

I tried this request :

LoginRequest* loginReq = [LoginRequest new];
loginReq.userName = @"username";
loginReq.password = @"1234567890";

__block NSString* token;
[objectManager postObject:loginReq
                     path:@"/sendboxapi/api/login"
                     parameters:nil
                        success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                            token = [mappingResult firstObject];
                            NSLog(@"RESULT : %@", token);
                        }
                        failure:^(RKObjectRequestOperation *operation, NSError *error) {
                            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                                            message:[error localizedDescription]
                                                                           delegate:nil
                                                                  cancelButtonTitle:@"OK"
                                                                  otherButtonTitles:nil];
                            [alert show];
                            NSLog(@"Hit error: %@", error);
                        }];

The raw response have this format : "47c4e389-be2b-466b-b015-c8d5682c4f0a"

I get this error : Hit error: Error Domain=org.restkit.RestKit.ErrorDomain Code=-1017 "Loaded an unprocessable response (200) with content type 'application/json'"

What is the Correct RKObjectMapping to set to be able to read this string from the webservice ?

Thank you

Wain Wain · Accepted Answer · 2013-07-24T15:12:36

When you use postObject, RestKit will try to apply the response data to the source object (your LoginRequest). So you need to add somewhere for that data to be stored and a (response) mapping and descriptor to process it.

Also, if the string returned to you is:

"47c4e389-be2b-466b-b015-c8d5682c4f0a"

That isn't JSON and you'll have issues trying to process it as such.

Mapping a simple string with RestKit

1 Answers