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POMagicalRecord + AFNetworking + NSFetchedResultsController, how to make it work?
 

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  1. POMagicalRecord + AFNetworking + NSFetchedResultsController, how to make it work?
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    <p>In my application I try to use MagicalRecord + AFNetworking + NSFetchedResultsController together, to synchronize data and dynamically display it on map or in tableView.</p> <p>Let's see some code for download method:</p> <pre><code>+ (void) getDataWithCompletionBlock: (void (^)(void)) block { NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:URL_GET_DATA]]; AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{ for (NSDictionary *dict in JSON) { [MyModel createOrUpdateMyModelFromDict:[dict mutableCopy]]; } [[NSManagedObjectContext MR_contextForCurrentThread] MR_saveInBackgroundCompletion:^{ [[NSManagedObjectContext MR_contextForCurrentThread] MR_saveNestedContexts]; block(); }]; }); } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) { DDLogError(@"getDataWithCompletionBlock FAILURE: %@", error); }]; [operation start]; } </code></pre> <p>I download data using <code>AFJSONRequestOperation</code>, then create models using GCD and background thread, save context for current thread and perform <code>successBlock</code> (MagicalRecord runs <code>successBlock</code> on <code>dispatch_get_main_queue()</code>, so it is called in GUI thread.</p> <p>Is this synchronization model ok ? Because sometimes (more often on real device than simulator) I get some errors from <code>NSFetchedResultsController</code> like "no object at index: in section at index:" or "CoreData could not fulfill a fault...".</p> <p>They all suggest, there is something wrong with Core Data and multithreading environment. Did anyone try to connect all these three tools to work together ? If so, what am I missing ? Do you have any good-working code samples for that architecture ?</p>
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