Validation not automatically called except when using KVC key-value-coding access

I implemented a KVC validation method that is called by coredata, but is not being called when I call person.name = @"alice";

is there a reason why KVC validation methods, in this case,

- (BOOL)validateName:(id *)ioValue error:(NSError **)outError {
    NSLog(@"validateName is validating...");    
    // ...    
}

is not being called when setting a value via property expression?

Another problem is that I can't get this to work either:

[person setValue:@"ok" 开发者_StackOverflowforKey:@"name"];

My NSLog line NEVER gets called.

Anything I'm missing?

This class is a subclass of NSManagedObject.

Does that matter?

Thanks,

Jamie

According to the Managed Object Validation documentation, validation methods are not run until the context is saved, or until you manually validate (with -validateForUpdate:, -validateForInsert:, or -validateForDelete:).