deleteObject hangs my app - ios

Question

TTNetworkDataSource* netSource = [TTNetworkDataSource sharedSource];
[netSource setContext:self];
TTDataSourceResponse* districtsResponse = [netSource requestDataWithQuery:#{#(OBJECT_TYPE): [HotlineDistrict clsName]}];
if (districtsResponse != nil) {
NSArray* objects = [self executeFetchRequestUnsafe:[NSFetchRequest fetchRequestWithEntityName:[HotlineDistrict clsName]] error:&localError];
NSInteger i = 0;
if (localError != nil) {
result = NO; return;
} else {
NSLog(#"%lu = fetchedObjects, %lu = districtsResponse", (unsigned long)objects.count, (unsigned long)districtsResponse.objects.count);
for (NSManagedObject* obj in objects) {
NSLog(#"Deleted Objects in fetched objects %ld", (unsigned long)i++);
[self deleteObject:obj];
}
for (NSManagedObject* obj in districtsResponse.objects) {
NSLog(#"Inserted Object in districtsResponse %ld", (unsigned long)i++);
[self insertObject:obj];
}
}
} else {
localError = [NSError errorInfo:#{NSLocalizedDescriptionKey: #"Error when getting districts."}];
result = NO;
}
TTDataSourceResponse* requestTypeResponse = [netSource requestDataWithQuery:#{#(OBJECT_TYPE): [HotlineRequestType clsName]}];
if (requestTypeResponse != nil) {
NSArray* objects = [self executeFetchRequestUnsafe:[NSFetchRequest fetchRequestWithEntityName:[HotlineRequestType clsName]] error:&localError];
NSInteger j = 0;
if (localError != nil) {
result = NO; return;
} else {
NSLog(#"%lu = fetchedObjects, %lu = requestTypeResponse", (unsigned long)objects.count, (unsigned long)requestTypeResponse.objects.count);
for (NSManagedObject* obj in objects) {
NSLog(#"Deleted Objects in fetched objects %ld", (unsigned long)j++);
[self deleteObject:obj];
}
for (NSManagedObject* obj in requestTypeResponse.objects) {
NSLog(#"Deleted Objects in requestTypeResponse %ld", (unsigned long)j++);
[self insertObject:obj];
}
}
} else {
localError = [NSError errorInfo:#{NSLocalizedDescriptionKey: #"Error when getting request types."}];
result = NO;
}
Here's my code, after [self deleteObject:obj] my app hangs
Manual debug by:
NSLog(#"%lu = fetchedObjects, %lu = districtsResponse", (unsigned long)objects.count, (unsigned long)districtsResponse.objects.count);
Give this result:
802 = fetchedObjects, 47 = districtsResponse
NSLogs in loops give enumeration of objects, in total we have summ of fetchedObjects and districtsResponse, even if place NSLog in the end of loop body. So its says that loop finished well. But the app is hangs. Those loops 2, it don't touch second loop, and if we delete those loops with deleteObject - it works.

Answer 1

You must not subclass NSManagedObjectContext as Apple says:
https://developer.apple.com/library/prerelease/ios/documentation/Cocoa/Reference/CoreDataFramework/Classes/NSManagedObjectContext_Class/index.html
Subclassing Notes
You are strongly discouraged from subclassing NSManagedObjectContext. The change tracking and undo management mechanisms are highly optimized and hence intricate and delicate. Interposing your own additional logic that might impact processPendingChanges can have unforeseen consequences. In situations such as store migration, Core Data will create instances of NSManagedObjectContext for its own use. Under these circumstances, you cannot rely on any features of your custom subclass. Any NSManagedObject subclass must always be fully compatible with NSManagedObjectContext (that is, it cannot rely on features of a subclass of NSManagedObjectContext).

Answer 2

I found the answer, our api sended nil values to the required attribute in entity, but anyway, thanks a lot guys