RESTkit Code 1001 could not find object for keyPath: "'" - ios4

Question

Thanks in advance for all your help community!! i had a early problem which was pointed out to me and i fixed "[Person object]-should be-->[Person alloc]init]i fixed that and now able to add a Person object now to my server. But here is the problem all the values on server are null and its throwing back a 1001 code Code=1001 "Could not find an object mapping for keyPath: ''" UserInfo=0x5938ce0 {=RKObjectMapperKeyPath, NSLocalizedDescription=Could not find an object mapping for keyPath: ''}
what am i mapping wrong any ideas? Noobie here and be grateful for any help provided!
Ohh yea am willing to pay for lessons on this matter if your in socal. Thnx again!
RKObjectMapping* userMapping = [RKObjectMapping mappingForClass:[Person class]];
[userMapping mapKeyPath:#"updated_at" toAttribute:#"updatedAt"];
[userMapping mapKeyPath:#"created_at" toAttribute:#"createdAt"];
[userMapping mapKeyPath:#"name" toAttribute:#"name"];
[userMapping mapKeyPath:#"id" toAttribute:#"personId"];
RKObjectMapping* dogMapping = [RKObjectMapping mappingForClass:[Dog class]];
[dogMapping mapKeyPath:#"created_at" toAttribute:#"createdAt"];
[dogMapping mapKeyPath:#"person_id" toAttribute:#"spersonId"];
[dogMapping mapKeyPath:#"name" toAttribute:#"name"];
[dogMapping mapKeyPath:#"updated_at" toAttribute:#"updatedAt"];
[dogMapping mapKeyPath:#"id" toAttribute:#"dogId"];
RKObjectMapping *dataMapping = [RKObjectMapping mappingForClass:[Data class]];
[dataMapping mapKeyPath:#"dog" toAttribute:#"dogs"];
[dataMapping mapKeyPath:#"person" toRelationship:#"person" withMapping:userMapping];
[[RKObjectManager sharedManager].mappingProvider addObjectMapping:dataMapping];
[[RKObjectManager sharedManager].mappingProvider setMapping:userMapping
forKeyPath:#"people"];
RKObjectRouter * router = [RKObjectManager sharedManager].router;
[router routeClass: [Person class] toResourcePath:#"/people/:personId"];
[router routeClass: [Person class] toResourcePath:#"/people"
forMethod:RKRequestMethodPOST];
RKObjectMapping *personSerializationMapping= [RKObjectMapping mappingForClass:
[NSMutableDictionary class]];
[personSerializationMapping mapAttributes:#"name", nil];
[[RKObjectManager sharedManager].mappingProvider
setSerializationMapping:personSerializationMapping forClass: [Person class]];
Person* daveLiu =[[[Person alloc]init]autorelease];
daveLiu.name = #"dave";
[[RKObjectManager sharedManager] postObject:daveLiu delegate:self];

Answer 1

All of my objects from my server are "anonymous" and I had this same problem with RestKit not being able to find the correct mapping. The way I fixed it was to use the objectManager methods that let me include the mapping:
[objectManager postObject:object mapResponseWith:[object objectMapping] delegate:self];
[objectManager loadObjectsAtResourcePath:path objectMapping:mapping delegate:self];
So now my contracts that all come from the server like this:
{
"Id": "12345678-1234-1234-1234-1234567890ab",
"Type": "SURVEY",
"Code": "1234",
"Description": "blah blah blah",
"Message": "blah blah blah",
"Url": "http://nowhere.com/",
"NextAttemptHours": 4
}
Can be mapped into the correct object. It's a bit of extra work to keep you object mappings available, but it does the job. I did it by implementing a class method on my objects to return the appropriate objectMapping which keeps things very clean and understandable.