RESTKit DELETE request not deleting local object on 2xx success - restkit-0.20

Question

According to the docs for 0.20 RK:
RKManagedObjectRequestOperation adds special behavior to DELETE requests. Upon retrieving a successful (2xx status code) response for a DELETE, the operation will invoke deleteObject: with the operations targetObject on the managed object context. This will delete the target object from the local store in conjunction the successfully deleted remote representation.
I have been trying to delete an object with such a request but no matter what I try I can't seem to get it to work. I successfully perform a request for many objects which get mapped to appropriate class, and get stored in core data. When I attempt a delete request on one of the objects and get a 200 success back, it does not deleted from local store.
Here's some code where I am no doubt missing a trick.
AppDelegate.m
...
//
// Match Mapping
//
RKEntityMapping *matchMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Match class])
inManagedObjectStore:objectManager.managedObjectStore];
NSDictionary *matchAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
#"objectId", #"id",
#"score", #"matchScore",
#"date", #"matchDate",
nil];
matchMapping.identificationAttributes = #[#"objectId"];
[matchMapping addAttributeMappingsFromDictionary:matchAttributes];
// Response descriptor for GET
[objectManager addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:matchMapping
method:RKRequestMethodGET
pathPattern:#"match/"
keyPath:#"matches"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];
// Response Descriptor for PUT
[objectManager addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:matchMapping
method:RKRequestMethodPUT
pathPattern:#"match/"
keyPath:#"match"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];
// Request Descriptor for DELETE
[objectManager addRequestDescriptor:[RKRequestDescriptor requestDescriptorWithMapping:[matchMapping inverseMapping]
objectClass:[Match class]
rootKeyPath:nil
method:RKRequestMethodDELETE]];
MatchDetailVC.m
...
- (void)deleteMatch {
NSDictionary *requiredParameters = #{
#"APIKey": #"xxxxx"
};
NSMutableURLRequest *request = [[RKObjectManager sharedManager] requestWithObject:self.match
method:RKRequestMethodDELETE
path:#"match/"
parameters:requiredParameters];
RKManagedObjectRequestOperation *operation = [[RKObjectManager sharedManager]
managedObjectRequestOperationWithRequest:request
managedObjectContext:[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
//[[RKManagedObjectStore defaultStore].mainQueueManagedObjectContext save:nil]; // IS THIS NEEDED?
NSLog(#"Successfully deleted match.");
[self.navigationController popToRootViewControllerAnimated:YES];
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", [error localizedDescription]);
}];
NSOperationQueue *operationQueue = [NSOperationQueue new];
[operationQueue addOperation:operation];
}
...
Thanks in advance and if you need more code, let me know.
Andy

Answer 1

I know this is quite an old post, but here is what I found out after searching for ages...
The local delete will fail if there is no valid response mapping for the DELETE response.
The problem wen't away for me when I created an empty response mapping like this:
RKObjectMapping* nullMapping = [RKObjectMapping mappingForClass:[NSNull class]];
[objectManager addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:nullMapping method:RKRequestMethodDELETE pathPattern:#"mybase/something/:myid/" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];