CoreData problem - AttributeDescription seems invalid --- What am I doing wrong?
CoreData problem - AttributeDescription seems invalid --- What am I doing wrong?
- Subject: CoreData problem - AttributeDescription seems invalid --- What am I doing wrong?
- From: Motti Shneor <email@hidden>
- Date: Thu, 02 Jun 2011 15:01:52 +0300
Hello everyone.
We work with a CoreData model that is memory-based. However, at times I would want to (partially) save an entity to the UserDefaults, as a dictionary. For that, I wrote a little NSManagedObject extension (Category) with the following method:
@interface NSManagedObject (OURExtension)
@property (readonly) NSMutableDictionary *attributesAsDictionary;
@end
- (NSMutableDictionary *)attributesAsDictionary {
NSMutableDictionary *attributesDictionary = [NSMutableDictionary dictionaryWithCapacity:[self.entity.attributesByName count]];
for (NSAttributeDescription* attribute in self.entity.attributesByName ) {
NSString *attribName = [attribute name];
id attribValue = [self valueForKey:attribName];
if (attribName && attribValue)
[attributesDictionary setObject:attribValue forKey:attribName];
}
return attributesDictionary;
}
Running the method for a nice entity that I just Saved (validated) and Fetched again (to be sure it's in the store) --- the method crashes horribly on the NSString *attribName = [attribute name];
If I step inside with the debugger, I see things I can't understand. I get into the loop, and for the first attribute ---
1. Debugger claims 'attribute's type is CFStringRef * instead of NSAttributeDescription*
2. Summary for attribute is "telephoneID" which is reasonable --- one of my attributes is named like that.
3. drilling down, the private "_name" iVar for the attribute is nil but when I try to get it :
4. NSString *attribName = [attribute name] crashes and debugger looses all track of stack or anything.
I looked for "valid" "isValid" or similar properties in NSAttributeDescription and its ancestor NSPropertyDescription to no avail. Nothing in the docs will tell me WHEN is it right to use the NSAttributeDescription in the above manner.
Ideas anyone?
Motti Shneor
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Ceterum censeo Microsoftinem delendam esse
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