Question

I’m fetching a user object from a server. If the request succeeds I get:

{ user = {
        User = { id = 1; }
} }

On failure I get:

{ user = false; }

I have a mapping that works fine in the success case: [mappingProvider setMapping:userMapping forKeyPath:@"user.User"];

But in the failure case, I get the following exception: 'NSUnknownKeyException', reason: '[<__NSCFBoolean 0x1c58f78> valueForUndefinedKey:]: this class is not key value coding-compliant for the key User.' I also tried setting userMapping as a relationship for keypath User on a mapping to generate an NSDictionary from the user keypath, no joy there either.

What is the correct way to deal with this? It seems like I need two different mappings for the user keypath, and to select which one based on whether on whether the object wants to be decoded to an NSBoolean…

Answer 1

I would suggest RKDynamicObjectMapping. Either of one of these two flavors should work for you:

- (void)setObjectMapping:(RKObjectMapping *)objectMapping whenValueOfKeyPath:(NSString *)keyPath isEqualTo:(id)value;

or

+ (RKDynamicObjectMapping *)dynamicMappingUsingBlock:(void(^)(RKDynamicObjectMapping *dynamicMapping))block;