RestKit not deleting orphaned relationship object - ios

Question

I have the following mapping:
RKEntityMapping *dashboardTeam = [RKEntityMapping mappingForEntityForName:#"DashboardTeam" inManagedObjectStore:managedObjectStore];
[dashboardTeam setAssignsDefaultValueForMissingAttributes:NO];
[dashboardTeam setAssignsNilForMissingRelationships:YES];
[dashboardTeam setShouldMapRelationshipsIfObjectIsUnmodified:YES];
[dashboardTeam addAttributeMappingsFromArray:#[#"id", #"name"]];
RKEntityMapping *dashboardLeague = [RKEntityMapping mappingForEntityForName:#"DashboardLeague" inManagedObjectStore:managedObjectStore];
[dashboardLeague setAssignsDefaultValueForMissingAttributes:YES];
[dashboardLeague setAssignsNilForMissingRelationships:YES];
[dashboardLeague setShouldMapRelationshipsIfObjectIsUnmodified:YES];
[dashboardLeague addAttributeMappingsFromArray:#[#"id", #"name"]];
[dashboardTeam addRelationshipMappingWithSourceKeyPath:#"league" mapping:dashboardLeague];
RKEntityMapping *dashboardGame = [RKEntityMapping mappingForEntityForName:#"DashboardGame" inManagedObjectStore:managedObjectStore];
[dashboardGame addAttributeMappingsFromArray:#[#"id", #"name", #"away", #"home", #"startTime"]];
[dashboardGame setAssignsNilForMissingRelationships:YES];
[dashboardGame setAssignsDefaultValueForMissingAttributes:YES];
[dashboardGame setShouldMapRelationshipsIfObjectIsUnmodified:YES];
RKDynamicMapping *dynamicGameMapping = [RKDynamicMapping new];
[dynamicGameMapping setObjectMappingForRepresentationBlock:^RKObjectMapping *(id representation) {
RKObjectMapping *testListMapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
for (NSString *key in representation) {
[testListMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:key toKeyPath:key withMapping:dashboardGame]];
}
[testListMapping setAssignsNilForMissingRelationships:YES];
[testListMapping setAssignsDefaultValueForMissingAttributes:YES];
return testListMapping;
}];
[dashboardGame addRelationshipMappingWithSourceKeyPath:#"league" mapping:dashboardLeague];
RKResponseDescriptor *teams = [RKResponseDescriptor responseDescriptorWithMapping:dashboardTeam method:RKRequestMethodGET pathPattern:#"/api/3/dashboard" keyPath:#"teams" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
RKResponseDescriptor *games = [RKResponseDescriptor responseDescriptorWithMapping:dynamicGameMapping method:RKRequestMethodGET pathPattern:#"/api/3/dashboard" keyPath:#"games" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[[RKObjectManager sharedManager] addResponseDescriptorsFromArray:#[teams, games]];
And the following fetch request:
[self.rkObjectManager addFetchRequestBlock:^NSFetchRequest *(NSURL *URL) {
RKPathMatcher *pathMatcher = [RKPathMatcher pathMatcherWithPattern:DashData.pathPattern];
NSDictionary *argsDict = nil;
BOOL match = [pathMatcher matchesPath:[URL relativePath] tokenizeQueryStrings:NO parsedArguments:&argsDict];
if (match)
{
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"DashboardGame"
inManagedObjectContext:[RKObjectManager sharedManager].managedObjectStore.persistentStoreManagedObjectContext];
[fetchRequest setEntity:entity];
return fetchRequest;
}
return nil;
}];
My issue is that after I get the initial server response, say with 1 league that has 10 games - if I delete a game and re-fetch the league from the server the orphaned object doesn't get deleted from Core Data. Using my fetch request results in all games being deleted.
In my Core Data model I have the delete rule set to Nullify and have tried all others but I'm not sure how to solve this, in the past I have used simple fetch requests like above but it doesn't seem to work when it's within a relationship.
What am I missing here?
Edit: I was able to get the objects to map using an answer here
Now I just need to get the orphaned objects to delete but the fetch request isn't working