I am using transient attributes as a nice and efficient way to display
formatted data (with line breaks) in an NSTableView, and am running
into trouble in my awakeFromFetch: method for a subclass of
NSManagedObject.
This works fine in the awakeFromFetch: when building a transient
attribute based on permanent attributes of the object in question, but
I'm trying to follow relationships to retrieve attributes from
several other NSManagedObjects.
The relationship is to the correct NSManagedObject, which is a fault,
as seen here:
12/14/08 5:50:43 PM myApp[14070] after we get it city =
<NSManagedObject: 0x150e4370> (entity: destination_city; id:
0x150d14e0 <x-coredata://E77970B1-4F89-4C1C-B788-334AEEF886EB/destination_city/p22919
> ; data: <fault>)
Trying to access attributes of the relation just fails with a message
like:
12/14/08 5:51:19 PM myApp[14070] *** NSRunLoop ignoring exception
'statement is still active' that raised during posting of delayed
perform with target 0x14c90c80 and selector 'invokeWithTarget:'
Sample code:
awakeFromFetch: in my NSManagedObject subclass
NSManagedObject *city = [self valueForKey:@"city"];
NSManagedObject *state = [self primitiveValueForKey:@"state"];
NSManagedObject *country = [self primitiveValueForKey:@"country"];
// ********* fails on the next statement - city is there, and marked
as a default...
NSString *cityName = [city valueForKey:@"city_name"];
NSString *stateName = [state valueForKey:@"state_name"];
NSString *countryName = [country valueForKey:@"countryName"];
NSString *transient_location = [NSString stringWithFormat:@"%@, %...@\n
%@", cityName, stateName, countryName];
displayPatternValue is much slower than this approach and I don't want
to denormalize my tables unless I have to do so.
Suggestions?
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