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POCoreData crash while saving after setting value for NSManagedObject's property
 

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  1. POCoreData crash while saving after setting value for NSManagedObject's property
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    <p>I have a problem with saving CoreData. Main 3 things to remember:</p> <ol> <li>I'm using NSFetchResultsController to populate my UITableView with data from CoreData</li> <li>I'm lazy downloading images to show them in cells.</li> <li>When downloading of icon ends I converta image data to base64 string and save that string in CoreData.</li> </ol> <p>Problem is that when I try to save CoreData changes after receving icons I get crash. When I commented part of code responsible for making changes to NSManagedObject everything worked fine, but I want to know how can I save that objects without crash.</p> <p>This is where I update NSManagedObject after downloading icon:</p> <pre><code>- (void)connectionDidFinishLoading:(NSURLConnection *)connection { if (self.activeDownload &amp;&amp; [self.activeDownload length]&gt;0) { NSString* base64 = [self.activeDownload base64Encoding]; // converting data to base64 NSError* error= nil; Offer* offerDB2 = [self.offer offerObject]; // Offer is NSManagedObject subclass of my Entity if (offerDB2) { [offerDB2 setImageData:base64]; // Setting property value (if commented -&gt; no crash) [CoreDataHandler save]; // This is where App crashes } } self.activeDownload = nil; self.imageConnection = nil; [IconDownloader doNext]; } </code></pre> <p>Now Offer class</p> <pre><code>#import &lt;CoreData/CoreData.h&gt; @interface Offer : NSManagedObject { } @property (nonatomic, retain) NSString * bigInfo; @property (nonatomic, retain) NSNumber * categoryID; @property (nonatomic, retain) NSNumber * databaseID; @property (nonatomic, retain) NSNumber * deleted; @property (nonatomic, retain) NSString * descriptionString; @property (nonatomic, retain) NSNumber * endDate; @property (nonatomic, retain) NSString * extendedInfo; @property (nonatomic, retain) NSNumber * offerType; @property (nonatomic, retain) NSString * photoLink; @property (nonatomic, retain) NSString * physicalUnit; @property (nonatomic, retain) NSString * shopName; @property (nonatomic, retain) NSNumber * size; @property (nonatomic, retain) NSString * sizeUnit; @property (nonatomic, retain) NSString * smallInfo; @property (nonatomic, retain) NSNumber * startDate; @property (nonatomic, retain) NSNumber * unitPrice; @property (nonatomic, retain) NSString * unitPriceName; @property (nonatomic, retain) NSString * imageData; @end #import "Offer.h" @implementation Offer @dynamic bigInfo; @dynamic categoryID; @dynamic databaseID; @dynamic deleted; @dynamic descriptionString; @dynamic endDate; @dynamic extendedInfo; @dynamic offerType; @dynamic photoLink; @dynamic physicalUnit; @dynamic shopName; @dynamic size; @dynamic sizeUnit; @dynamic smallInfo; @dynamic startDate; @dynamic unitPrice; @dynamic unitPriceName, imageData; -(NSNumber*)sectionNumber{ return self.offerType; } @end </code></pre> <p>CrashLog looks like that:</p> <pre><code>*** -[NSCFType evaluateWithObject:]: unrecognized selector sent to instance 0x4354210 Program received signal: “EXC_BAD_ACCESS”. #0 0x32668ec0 in objc_msgSend #1 0x32de2b5e in __CFExceptionProem #2 0x32de2bcc in -[NSObject doesNotRecognizeSelector:] #3 0x32d67b18 in ___forwarding___ #4 0x32d5e840 in __forwarding_prep_0___ #5 0x30537cbe in -[NSFetchedResultsController(PrivateMethods) _objectInResults:] #6 0x30538d16 in -[NSFetchedResultsController(PrivateMethods) _preprocessUpdatedObjects:insertsInfo:deletesInfo:updatesInfo:sectionsWithDeletes:newSectionNames:treatAsRefreshes:] #7 0x3053aa2c in -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:] #8 0x33f765d8 in _nsnote_callback #9 0x32d9e510 in _CFXNotificationPostNotification #10 0x33f741b2 in -[NSNotificationCenter postNotificationName:object:userInfo:] #11 0x304b4388 in -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] #12 0x3050768a in -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:] #13 0x3049c2b0 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] #14 0x304cb186 in -[NSManagedObjectContext save:] </code></pre> <p>Possible problems:</p> <ol> <li>CoreData while saving can deal with lots of data. Those images converted to base64 can contain lots of characters.</li> <li>Lines #5,#6,#7 say something about NSFetchResultsController.</li> </ol> <p><strong>SOLVED:</strong></p> <p>I simply released NSPredicate wchich was autoreleased object, so after saveing CoreDatra my NSFetchResultsController wanted to update its data, everuthing crashed.</p>
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