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PO"Core Data could not fulfill a fault" for objects that were created in the appDelegate managedObjectContext on the main thread
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  1. PO"Core Data could not fulfill a fault" for objects that were created in the appDelegate managedObjectContext on the main thread
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    copied!<p>I mistakenly created a group of objects on a background thread, which created a new managedObjectContext in which the objects were saved.</p> <p>This resulted in numerous "Core Data could not fulfill a fault" crashes in my live app. Please note - I am not trying to delete these objects - it is a problem with the way they were created, when I try to save them again afterwards in the app delegate (main) context on the main thread.</p> <p>The thing that is confusing is that I am seeing this error for other objects, objects of a different type. They can be related to the objects created in the background thread, though they themselves were not created in the in the background thread.</p> <p>I am confused as to how this could have happened. How could I get the "Core Data could not fulfill a fault" error for an object not created in the background thread, but the app delegate (main) context?</p> <p>And is there any way at all to go back and fix this mistake in the live apps of my users?</p> <p>Let me reference my other question, through which I discovered this error: <a href="https://stackoverflow.com/questions/19994482/core-data-could-not-fulfill-a-fault-for-objects-that-were-not-deleted">"Core Data could not fulfill a fault" for objects that were not deleted</a></p> <p>I wrote up a new question because I feel that it is a different issue - though most definitely related. </p> <p>Here is the code that created the objects in the background thread:</p> <pre><code>- (void)friendPickerViewControllerDidChooseFriends:(NSArray *)friends { __ENTERING_METHOD__ if (friends.count &gt; 0) { [[FacebookHelper sharedManager] friendPickerController].navigationController.navigationBar.userInteractionEnabled = NO; [self startProgressIndicator]; [self performSelectorInBackground:@selector(importFriends:) withObject:friends]; } else { [self dismissModalImportViewControllerAnimated];//releases picker delegates, etc } } #pragma mark - #pragma mark Import Friend - (void)importFriends:(NSArray*)friends { __ENTERING_METHOD__ for (NSDictionary&lt;FBGraphUser&gt; *friend in friends) { [self importFriend:friend withCompletion:^(void){ CGFloat friendNumber = [friends indexOfObject:friend]+1; CGFloat friendCount = friends.count; self.importProgress = friendNumber/friendCount; }]; } } - (void)importFriend:(NSDictionary&lt;FBGraphUser&gt;*)friend withCompletion:( void (^) (void) )completionBlock { __ENTERING_METHOD__ Person *myNewPerson = [GetObjectArrayHelper createNewPersonMocSaveNew:YES]; myNewPerson.facebookID = friend.id; myNewPerson.facebookName = friend.name; NSString *nameFirst = [friend.first_name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; NSString *nameLast = [friend.last_name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; NSString *imageID = friend.id; UIImage *pickedImage = nil; if(imageID){ pickedImage = [FacebookHelper imageForObject:imageID]; } DLog(@"pickedImage:%@",pickedImage); if(pickedImage){ [self setImagesForFacebookImage:pickedImage forPerson:myNewPerson]; } //we should ALWAYS have a name [Helper changePerson:myNewPerson firstName:nameFirst lastName:nameLast]; if(completionBlock) { completionBlock(); } } - (void)finishedImporting { __ENTERING_METHOD__ [SVProgressHUD showSuccessWithStatus:[self completeString]]; [self performSelector:@selector(dismissModalImportViewControllerAnimated) withObject:nil afterDelay:SV_PROGRESS_HUD_SUCCESS_DELAY]; } - (void)dismissModalImportViewControllerAnimated { __ENTERING_METHOD__ [Helper mocSave];//THIS SAVES IN THE APP DELEGATE MANAGED OBJECT CONTEXT - [SVProgressHUD dismiss]; [self dismissViewControllerAnimated:YES completion:^(void){ [[FacebookHelper sharedManager] friendPickerController].delegate = nil; [[FacebookHelper sharedManager] friendPickerController].navigationController.navigationBar.userInteractionEnabled = YES; }]; } </code></pre> <p>Please note that the objects that I am concerned about are not any of the objects created here (or in methods called here), but objects that later become associated with these objects.</p> <p>Why are THEY "Core Data could not fulfill a fault" crash? (I understand why any object created here or in a method called here would get it).</p> <p>Also - once I figure out why this mess happened (and fix the code that caused it) I need to fix the rogue objects in my users' live apps. I could really use some advise on that as well!</p>
 

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