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POHow to save ManagedObjectContext at regular intervals? Currently dropping 1/3 of objects added
 

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  1. POHow to save ManagedObjectContext at regular intervals? Currently dropping 1/3 of objects added
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    <p>I'm trying to save the MOC at intervals of 1000, however the below code just seems to miss some of them. This only saved 2/3 of the objects, the rest just seemed to disappear into the abyss. This seems like such a cludgy way to achieve this, so if anyone can suggest a better way I'd love to hear it. </p> <p>This method is also taking about 9 minutes to add 115,000 objects. Is there anything I can do to improve this? Thanks. </p> <pre><code>dispatch_async(backgroundDispatchQueue,{ NSManagedObjectContext *backgroundThreadContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSConfinementConcurrencyType]; [backgroundThreadContext setPersistentStoreCoordinator:self.persistentStoreCoordinator]; [backgroundThreadContext setUndoManager:nil]; [products enumerateObjectsUsingBlock:^(id product, NSUInteger idx, BOOL *stop) { NSManagedObject* newProduct; newProduct = [NSEntityDescription insertNewObjectForEntityForName:@"Products" inManagedObjectContext:backgroundThreadContext]; [newProduct setValue:[product valueForKey:@"product_name"] forKey:@"name"]; [newProduct setValue:[product valueForKey:@"product_codes"] forKey:@"codes"]; if ([product valueForKey:@"information"] == (id)[NSNull null]){ // No information, NULL [newProduct setValue:@"" forKey:@"information"]; } else { NSString *information = [product valueForKey:@"information"]; [newProduct setValue:information forKey:@"information"]; } if ([product valueForKey:@"megaimportant"] == (id)[NSNull null]){ // No information, NULL [newProduct setValue:@"" forKey:@"megaimportant"]; } else { NSString *megaimportant = [product valueForKey:@"megaimportant"]; [newProduct setValue:megaimportant forKey:@"megaimportant"]; } if ((self.productDBCount % 1000) == 0){ NSLog(@"SAVE ME"); NSError *error; if(![backgroundThreadContext save:&amp;error]) { NSLog(@"There was a problem saving the context (add/update). With error: %@, and user info: %@", [error localizedDescription], [error userInfo]); } } else if ((self.productDBCount + 1) == self.totalCount){ NSLog(@"Final Save"); NSError *error; if(![backgroundThreadContext save:&amp;error]) { NSLog(@"There was a problem saving the context (add/update). With error: %@, and user info: %@", [error localizedDescription], [error userInfo]); } } dispatch_async(dispatch_get_main_queue(), ^ { self.productDBCount = self.productDBCount + 1; float progress = ((float)self.productDBCount / (float)self.totalCount); int percent = progress * 100.0f; self.downloadUpdateProgress.progress = progress; self.percentageComplete.text = [NSString stringWithFormat:@"%i", percent]; NSLog(@"Added / updated product %f // ProductDBCount: %i // Percentage progress: %i // Total Count: %i", progress, self.productDBCount, percent, self.totalCount); NSDate *currentProcessedDate = [NSDate date]; NSTimeInterval timeSinceStarted = [currentProcessedDate timeIntervalSinceDate:self.startProcessing]; NSInteger remainingProcesses = self.totalCount - self.productDBCount; float timePerProcess = timeSinceStarted / (float)self.productDBCount; float remainingTime = timePerProcess * (float)remainingProcesses; self.timeRemaining.text = [NSString stringWithFormat:@"ETA: %0.0f minutes %0.0f seconds", (((float)remainingTime - fmodf(remainingTime, 60.0f))/60), fmodf(remainingTime, 60.0f)]; if (self.productDBCount == self.totalCount){ [self updatesCompleted:[jsonArray valueForKey:@"last_updated"]]; } }); }]; }); </code></pre>
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