Restkit - Relationship mapping not working - ios

Question

I'm experiencing Restkit, using the version 0.25.0. I followed exactly what the documentation says for the relationship mapping, but for some reasons, I have an empty mapping result !
But when I remove the relationship object (data), I have a mapping result !!! But of course, the mapping result doesn't contain the data I need, the one I added as relationship.
I followed the example they have in this link :
https://github.com/RestKit/RestKit/wiki/Object-mapping#relationships
When I print the JSON with the debugger, here's the output :
{
"status": "success",
"data": {
"id": 11,
"provider": "email",
"uid": "riri#gmail.com",
"name": null,
"nickname": null,
"image": null,
"email": "riri#gmail.com",
"country": "United States",
"city": "Milan, Metropolitan City of Milan, Italy",
"gender": "m",
"birthday": "2015-06-25"
}
}
Here's the code how I make the request :
RKObjectManager *manager = [RKObjectManager sharedManager];
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);
RKObjectMapping *jsonResponseMapping = [JSONResponse mappingObject];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:jsonResponseMapping
method:RKRequestMethodAny
pathPattern:#"/auth/sign_in"
keyPath:nil
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[manager addResponseDescriptor:responseDescriptor];
NSDictionary *parameters = #{
#"email": user.email,
#"password": user.password
};
[manager postObject:user path:#"/auth/sign_in" parameters:parameters success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
NSDictionary *headerFields = operation.HTTPRequestOperation.response.allHeaderFields;
[self updateUserInfoForResponse:[mappingResult firstObject] headerFields:headerFields];
if (successBlock) {
successBlock([mappingResult firstObject]);
}
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
if (failureBlock) {
failureBlock(error.userInfo[RKObjectMapperErrorObjectsKey][0], error);
}
}];
.m of JSONResponse class:
+ (RKObjectMapping *)mappingObject {
RKObjectMapping *jsonResponseMapping = [RKObjectMapping mappingForClass:[JSONResponse class]];
[jsonResponseMapping addAttributeMappingsFromDictionary:#{
#"status": #"status",
#"errors": #"errors",
}];
RKRelationshipMapping *userRelationShip = [RKRelationshipMapping relationshipMappingFromKeyPath:#"data" toKeyPath:#"data" withMapping:[User mappingObject]];
[jsonResponseMapping addPropertyMapping:userRelationShip];
return jsonResponseMapping;
}
.h Of JSONResponse class :
#import <RestKit/Restkit.h>
#import <Foundation/Foundation.h>
#import "User.h"
#interface JSONResponse : NSObject
#property (nonatomic, copy) NSString *status;
#property (nonatomic) User *data;
#property (nonatomic, copy) NSDictionary *errors;
/**
#function mappingObject
#return RKObjectMapping mapping for the json response
*/
+ (RKObjectMapping *)mappingObject;
#end
.m of User class
#import "User.h"
#implementation User
+ (RKObjectMapping *)mappingObject {
RKObjectMapping *userMapping = [RKObjectMapping mappingForClass:[User class]];
[userMapping addAttributeMappingsFromDictionary:#{
#"email": #"email",
#"password": #"password",
#"gender": #"gender",
#"birthday": #"dateOfBirth",
#"city": #"city",
#"country": #"country"
}];
return userMapping;
}
#end
.h of User class
#class RKObjectMapping;
#interface User : NSObject
#property (nonatomic, copy) NSString *email;
#property (nonatomic, copy) NSString *password;
#property (nonatomic, copy) NSString *gender;
#property (nonatomic, copy) NSString *dateOfBirth;
#property (nonatomic, copy) NSString *city;
#property (nonatomic, copy) NSString *country;
/**
#function mappingObject
#return RKObjectMapping mapping object for user
*/
+ (RKObjectMapping *)mappingObject;
#end
Is there anything wrong in my models objects ? The relationship is set properly right ? I do have the data property in the JSONResponse, and the JSON contains correctly the keyPath data.
So I'm pretty confused why I have results when I remove my relationship, and why the mapping result is empty when I have the relationship. It's even doesn't go in the failureCallback, the operation is successful, the result is empty.
Any ideas ??
EDIT :
Here's the logs :
2015-09-15 07:27:50.649 testRestkit[53698:3448725] D restkit.object_mapping:RKPropertyInspector.m:154 Cached property inspection for Class 'JSONResponse': {
data = "<RKPropertyInspectorPropertyInfo: 0x7facf2c5fa00>";
status = "<RKPropertyInspectorPropertyInfo: 0x7facf2c5f7d0>";
}
2015-09-15 07:27:50.650 testRestkit[53698:3448725] D restkit.object_mapping:RKPropertyInspector.m:154 Cached property inspection for Class 'User': {
email = "<RKPropertyInspectorPropertyInfo: 0x7facf2c60680>";
}
2015-09-15 07:27:50.820 testRestkit[53698:3448725] I restkit.network:RKObjectRequestOperation.m:150 POST 'http://sandrotchikovani.com/test.php'
2015-09-15 07:27:51.236 testRestkit[53698:3448938] D restkit.object_mapping:RKMapperOperation.m:407 Executing mapping operation for representation: {
data = {
email = "lol#gmail.com";
};
status = success;
}
and targetObject: <User: 0x7facf2c05820>
2015-09-15 07:27:51.237 testRestkit[53698:3448938] T restkit.object_mapping:RKMapperOperation.m:350 Examining keyPath '<null>' for mappable content...
2015-09-15 07:27:51.237 testRestkit[53698:3448938] D restkit.object_mapping:RKMapperOperation.m:330 Found mappable data at keyPath '<null>': {
data = {
email = "lol#gmail.com";
};
status = success;
}
2015-09-15 07:27:51.237 testRestkit[53698:3448938] D restkit.object_mapping:RKMapperOperation.m:433 Finished performing object mapping. Results: {
}
Isn't weird that in the log, it says and targetObject: <User: 0x7facf2c05820> ? When I remove the relationship, there is a mapping result and the targetObject, displays "null".

Answer 1

You are calling postObject:..., and when you do that RestKit will map back to the original object. In this case that's a user and that's why you're seeing the log and targetObject: <User: 0x7facf2c05820>.
The easiest thing for you to do is to setup your JSONResponse so that you post it and receive the response into it. It already has the required user so a simple change to the request descriptor to pull out the user fields should be enough.
Alternatively there are a bunch of other questions about mapping to a different object after posting.