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POproblem with accessing attributes of relationship after fetching with setPropertiesToFetch
 

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  1. POproblem with accessing attributes of relationship after fetching with setPropertiesToFetch
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    <p>I'm only fetching some attributes and a 1-to-1 relationship of an entity using -setPropertiesToFetch and result type set to NSDictionaryResultType. Now I have a problem accessing the attributes of the returned relationship. As soon as I want to access a property I get an NSInvalidArgumentException', reason: unrecognized selector sent to instance</p> <p>Here is the full Exception:</p> <pre><code>2011-03-23 11:02:10.435 ThurboApp[32996:207] -[_NSObjectID_48_0 lon]: unrecognized selector sent to instance 0x5a3f490 2011-03-23 11:02:10.441 ThurboApp[32996:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_NSObjectID_48_0 lon]: unrecognized selector sent to instance 0x5a3f490' </code></pre> <p>Here is the corresponding source code:</p> <pre><code> - (void)fetchAllPois { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"POI" inManagedObjectContext:self.managedObjectContext]; request.entity = entity; [request setResultType:NSDictionaryResultType]; [request setPropertiesToFetch:[NSArray arrayWithObjects:@"poiId",@"categoryId",@"poiTitle",@"coordinates", nil]]; request.sortDescriptors = nil; request.predicate = nil; NSError *error = nil; self.fetchResult = [self.managedObjectContext executeFetchRequest:request error:&amp;error]; } - (MapPoint *)createMapPointFromDictionary:(NSDictionary *)dict { NSString *poiId = [dict objectForKey:@"poiId"]; NSString *title = [dict objectForKey:@"poiTitle"]; Coordinates *coords = (Coordinates *)[dict objectForKey:@"coordinates"]; NSNumber *category = [dict objectForKey:@"categoryId"]; CLLocationCoordinate2D coordinates = CLLocationCoordinate2DMake([coords.lat doubleValue], [coords.lon doubleValue]); //here raises the exception MapPoint *p = [[[MapPoint alloc] initWithPoiId:poiId title:title category:[category intValue] coordinates:coordinates] autorelease]; return p; } </code></pre> <p>interface for Coordinates:</p> <pre><code>@interface Coordinates : NSManagedObject { } @property (nonatomic, retain) NSNumber * lat; @property (nonatomic, retain) NSNumber * alt; @property (nonatomic, retain) NSNumber * lon; @property (nonatomic, retain) NSManagedObject * poi; @end </code></pre> <p>I've already checked, that the values returned in the dictionaries are correct. Even coordinates points to a Coordinate object.</p> <p>Help is much appreciated.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USSam Hitz
    1. USSam Hitz
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. VO
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      1. POproblem with accessing attributes of relationship after fetching with setPropertiesToFetch
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      1. VTFavorite
    1. COSo what was the selector that was sent? Providing the full exception information would be helpful.
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      1. POproblem with accessing attributes of relationship after fetching with setPropertiesToFetch
      1. USfreespace
    2. CO@freespace lon and lat are sent to Coordinates
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      1. POproblem with accessing attributes of relationship after fetching with setPropertiesToFetch
      1. USSam Hitz
    3. COadded the full exception description
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      1. POproblem with accessing attributes of relationship after fetching with setPropertiesToFetch
      1. USSam Hitz
 

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