clear DB

gistfile1.txt

    // Cancel network requests
    // Delete all managed objects
    NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
        NSManagedObjectContext *managedObjectContext = [RKManagedObjectStore defaultStore].persistentStoreManagedObjectContext;
        [managedObjectContext performBlockAndWait:^{
            NSError *error = nil;
            for (NSEntityDescription *entity in [RKManagedObjectStore defaultStore].managedObjectModel) {
                NSFetchRequest *fetchRequest = [NSFetchRequest new];
                [fetchRequest setEntity:entity];
                [fetchRequest setIncludesSubentities:NO];
                NSArray *objects = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
                if (! objects) RKLogWarning(@"Failed execution of fetch request %@: %@", fetchRequest, error);
                for (NSManagedObject *managedObject in objects) {
                    [managedObjectContext deleteObject:managedObject];
                }
            }
            
            BOOL success = [managedObjectContext save:&error];
            if (!success) RKLogWarning(@"Failed saving managed object context: %@", error);
        }];
    }];
    [operation setCompletionBlock:^{
        if(completion) completion();
        // Do stuff once the truncation is complete
    }];
    [operation start];