Re: Core Data fetch exception... further
Re: Core Data fetch exception... further
- Subject: Re: Core Data fetch exception... further
- From: Fritz Anderson <email@hidden>
- Date: Sun, 12 Jul 2009 14:18:40 -0500
On 12 Jul 2009, at 2:05 PM, Fritz Anderson wrote:
I have an entity, "Sale," that has a transient attribute
"latestDate." It is marked optional/transient/indexed in the MOM;
I've also tried it without setting optional. I set latestDate in
awakeFromFetch and awakeFromInsert. I use [NSDate
dateWithTimeIntervalSinceReferenceDate: 0] as a flag value.
At some point in my application, I want to retrieve all Sales that
don't have that flag value. I do:
=====
NSFetchRequest * fetch = [[NSFetchRequest alloc] init];
fetch.entity = [NSEntityDescription entityForName: @"Sale"
inManagedObjectContext: gMoc];
NSSortDescriptor * sort = [[NSSortDescriptor alloc] initWithKey:
@"latestDate"
ascending: NO];
fetch.sortDescriptors = [NSArray arrayWithObject: sort];
[sort release];
NSPredicate * pred = [NSPredicate predicateWithFormat:
@"latestDate != %@",
[NSDate dateWithTimeIntervalSinceReferenceDate: 0]];
fetch.predicate = pred;
NSError * error = nil;
NSArray * retval = [gMoc executeFetchRequest: fetch error: &error];
=====
The execute... method raises
'NSInvalidArgumentException', reason: 'keypath latestDate not found
in entity <NSSQLEntity Sale id=2>'
Only one Sale object is in the MOC. awakeFromInsert was called on it
before this fetch is executed. I've searched my project for regular
expressions that should catch most possible misspellings.
This is surely a rookie mistake, but I'm out of ideas. What am I
doing wrong?
The predicate seems to be a red herring. Commenting out
"fetch.predicate = pred" does not work around the bug, nor does
changing the predicate to reference another attribute.
I've already mentioned that latestDate is set up in the MOM. In my
code, it's
@property(nonatomic, retain) NSDate * latestDate;
@dynamic latestDate;
Switching from self.latestDate = to [self setPrimitiveLatestDate:] in
the awake... methods had no effect.
I've verified that there is only one Sale. It has not been saved.
— F
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