Core Data setPrimitive-setter causes EXC_BAD_ACCESS

Question

when I try to set the variable `eventId` of my `NSManagedObject (Event)` I get ther error `EXC_BAD_ACCESS`. I don't know the reason. Here's the code of my class `Event` ``` @interface Event : NSManagedObject @property (assign) NSInteger eventId; @end @interface Event (PrimitiveAccessors) - (NSInteger)primitiveEventId; - (void)setPrimitiveEventId:(NSInteger)event_id; @end @implementation Event @dynamic eventId; ... -(NSInteger)eventId { [self willAccessValueForKey:@"eventId"]; NSInteger id = [self eventId]; [self didAccessValueForKey:@"eventId"]; return id; } -(void)setEventId:(NSInteger)event_id { [self willChangeValueForKey:@"eventId"]; [self setPrimitiveEventId:event_id]; //Here I get the error [self didChangeValueForKey:@"eventId"]; } ... ``` Anyone can solve the problem? Thanks for help

Accepted Answer

If you look closely at the documentation, you'll see that the primitive accessor methods for the scalar attribute `double length` in the example still use `NSNumber *` arguments and return values:

```
@interface MyManagedObject (PrimitiveAccessors)
@property (nonatomic, retain) NSNumber *primitiveLength;
@end
```

[Note: I added the `*` that was missing in the original code snippet in Apple's documentation.]

So try declaring your primitive accessors with `NSNumber *` arguments and return values.

Or if you really must, consider implementing your own primitive accessor methods.

Core Data setPrimitive-setter causes EXC_BAD_ACCESS

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