CODEWITHSUNDEEP
objective-ccore-data
Matt Douhan
Matt Douhan

Reputation: 2113

Core Data update does not save and does not give any error, why?

I am using a very simple piece of code to update an NSManagedObject, but the save does not make it to the persistent store (SQLite). There are no error messages and the logs look ok so I am a little lost.

I have scaled down the code as much as possible to try and isolate the problem as shown below.

The logs tell me that the orderNumber and status are set correctly and also the debug output of the arrays are all correct, but my simple update still fails without any error at all.

+ (int) synchOrderWithStatusUpdate:(NSString *)orderNumber : (int)status {
    if ([NWTillHelper isDebug] == 1) {
        NSNumber *statusCheck = [NSNumber numberWithInt:status];
        NSLog(@"WebServices:synchOrderWithStatusUpdate:ordernumber = %@, status = %d, status2 = %@", orderNumber, status, statusCheck);
    }

    synchOrderErrorCode = 0;

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];

    NSManagedObjectContext *context = appDelegate.persistentContainer.viewContext;

    // *** The query for all tables uses orderNumber as selection so we set that up first for re use
    NSPredicate *predicateOrderNumber =[NSPredicate predicateWithFormat:@"orderNumber like[cd] %@", [NWTillHelper getCurrentOrderNumber]];

    NSFetchRequest *fetchRequestOh = [[NSFetchRequest alloc] initWithEntityName:@"OrderHead"];
    NSFetchRequest *fetchRequestOrp = [[NSFetchRequest alloc] initWithEntityName:@"OrderRow"];
    NSFetchRequest *fetchRequestTender = [[NSFetchRequest alloc] initWithEntityName:@"Tender"];

    fetchRequestOh.predicate = predicateOrderNumber;
    fetchRequestOrp.predicate = predicateOrderNumber;
    fetchRequestTender.predicate = predicateOrderNumber;

    fetchRequestOh.resultType = NSDictionaryResultType;
    fetchRequestOrp.resultType = NSDictionaryResultType;
    fetchRequestTender.resultType = NSDictionaryResultType;

    NSError *errorOh = nil;
    NSMutableArray *orderHeads = [[context executeFetchRequest:fetchRequestOh error:&errorOh] mutableCopy];

    NSError *errorOrp = nil;
    NSArray *orderRows = [[context executeFetchRequest:fetchRequestOrp error:&errorOrp] mutableCopy];

    NSError *errorTender = nil;
    NSArray *tenderRows = [[context executeFetchRequest:fetchRequestTender error:&errorTender] mutableCopy];

    if ([NWTillHelper isDebug] == 1) {
        NSLog(@"WebServices:synchOrderWithStatusUpdate:orderHeadsArray: %@", [orderHeads objectAtIndex:0]);
        NSLog(@"WebServices:synchOrderWithStatusUpdate:orderRowsArray: %@", orderRows);
        NSLog(@"WebServices:synchOrderWithStatusUpdate:tenderRowsArray: %@", tenderRows);
    }

    // *** Set the status before upload since this dictates what will happen in backend
    // *** regardless if synch is successful or not
    NSManagedObject *orderHeadObject = nil;
    orderHeadObject = [orderHeads objectAtIndex:0];
    [orderHeadObject setValue:[NSNumber numberWithInt:status] forKey:@"status"];

    // Save the objects to persistent store
    NSError *error = Nil;
    [context save:&error];

    NSLog(@"Jongel Error = %@", error);

    if(error !=nil) {
        if([NWTillHelper isDebug] == 1) {
            NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
        }
        synchOrderErrorCode = 99;
    }

    return 10101;

Upvotes: 0

Views: 27

Answers (1)

nils
nils

Reputation: 1976

The orderHeads are fetched as dictionaries. The NSManagedObjectContext will not be aware of any changes made to a dictionary. Only NSManagedObjects will be managed by the NSManagedObjectContext, hence the name ;-)

Try to fetch the orderHeadObject as an NSManagedObject as this will allow you to save the changes back into the store. If you need the dictionary for JSON serialisation: Just fetch it again as a dictionary after you have made the changes. That second fetch will be very fast since all values of the object are already cached, so CoreData won't have to reload from the database.

Upvotes: 1

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