RestKit Core Data mapping one to many - ios

Question

I am using RestKit to map the following JSON to core data.
This is my model:
this is my methods:
RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([User class]) inManagedObjectStore:managedObjectStore];
userMapping.identificationAttributes = #[#"id"];
[userMapping addAttributeMappingsFromDictionary:#{
#"birthday":#"birthday",
#"email":#"email",
#"facebook_token":#"facebook_token",
#"first_name":#"first_name",
#"gender":#"gender",
#"interested_in":#"interested_in",
#"last_name":#"last_name",
#"password":#"password",
#"m8_status":#"m8_status",
#"status":#"status",
#"languages": #"languages",
#"hometown":#"hometown",
#"location":#"location",
#"avatar_url":#"avatar_url",
#"mood":#"mood"
}];
RKEntityMapping *findUserMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([FindUser class]) inManagedObjectStore:managedObjectStore];
findUserMapping.identificationAttributes = #[#"id"];
[findUserMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:#"users" toKeyPath:#"users" withMapping:userMapping]];
[manager addResponseDescriptorsFromArray:#[
[RKResponseDescriptor responseDescriptorWithMapping:findUserMapping
pathPattern:#"/v1/users"
keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]
]];
This is getting objects from example JSON:
{
"users": [
{
"avatar_url": null,
"birthday": "04/11/1984",
"email": "antonina.duminskaya#wildermancruickshank.co.uk", "first_name": "Antonina",
"gender": "female",
"hometown": null,
"id": "5264ee384d61632c4b2f0000",
"interested_in": [
"male",
"female" ],
"languages": [], "last_name": "Duminskaya", "location": null, "m8_status": null,
"mood": null,
"status": null
} ]
}
here:
[objectManager getObjectsAtPath:#"/v1/users" parameters:#{#"session_id":session.id} success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
FindUser *findUsers = [[self.fetchedFindUsersResultsController fetchedObjects] lastObject];
NSLog(#"%#", findUsers.users);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
}];
I have message in log:
Relationship 'users' fault on managed object (0x8e964a0) <FindUser: 0x8e964a0> (entity: FindUser; id: 0x8da0790 <x-coredata://083BB731-FDD7-4A35-A174-724F50862A02/FindUser/p1> ; data: {
id = nil;
users = "<relationship fault: 0x8deb260 'users'>";
})
And In mappingResults I have all results about json

Answer 1

Core Data is representing the relationship initially as fault saving memory by not loading all the object graph at once.
https://developer.apple.com/library/ios/documentation/cocoa/conceptual/CoreData/Articles/cdFaultingUniquing.html
Also, do not use the reserved word 'id' as the Restkit identification attribute for your managed objects. Try using findUserId and userId and update your mappings accordingly.