Documentation? "NSNull" does not appear in the documentation. http://developer.apple.com/mac/library/documentation/cocoa/reference/CoreDataFramework/Classes/NSManagedObject_Class/Reference/NSManagedObject.html
NSNull is conceptually the wrapper for nil, like NSNumber is the wrapper for a number. It is conceptually inconsistent to treat them differently. NSMutableDictionary* dict = [NSMutableDictionary dictionary]; [dict setObject: 5 forKey: @"foo"] // fails - must have object [dict setObject [NSNumber numberWithInt: 5] forKey: @"foo"]; // OK [dict setObject: nil forKey: @"bar"] // fails - must have object [dict setObject: [NSNull null] forKey: @"bar"]; // OK NSManagedObject* obj; // gets created somehow [obj setValue: nil forKey: @"bar"]; // succeeds where NSDictionary fails [obj setValue: [NSNull null] forKey: @"bar"]; // fails where NSDictionary succeeds so - this is conceptually buggy thinking and the thoughtful developer could be forgiven for being VERY SURPRISED by this behavior that is NOT DOCUMENTED. On Feb 28, 2010, at 6:31 PM, Kyle Sluder wrote: > On Sun, Feb 28, 2010 at 6:16 PM, Eagle Offshore <eagleoffsh...@mac.com> wrote: >> Really? This is a problem somehow? > > Yes. You can either provide an object or nil. You gave it an object it > didn't like. > >> NSManagedObject couldn't just take the hint and go with nil? > > Would you rather an API based on "taking hints" or an API based on > documentation? You can either provide nil or a string. Why should > NSManagedObject assume that an object of a certain class should get > special treatment? Should it do the same for NSValues wrapping an > integer 0? What about NSNoSelectionMarker or NSNotApplicableMarker? > > --Kyle Sluder _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
