Errata for Core Data

#46682: In the second code listing on the page, defining addImageSheetDidEnd:..., there is this line:

NSString *destPath = [self applicationSupportFolder];

I get a warning saying that "applicationSupportFolder" may not exist on the opject. Running it anyways results in an error when we get to that line. I can't find anything in the docs about this, whether it was deprecated or how to find this value. A bit of Googling leads me to believe that this might be a method added to the class...but I don't seem to be able to find it.

For reference, I am using Xcode 4 and an edition of the book that was released in September 2009, so I admit perhaps I'm just behind the times in actually getting around to reading this... --Dru Kepple

#46683: A follow up to #46682:

I found it. Xcode 4 must have some modified templates. There is a applicationFilesDirectory method defined in the app delegate. It returns an NSURL, so it would appear that this line is an Xcode 4 worthy replacement:

NSString *destPath = [[self applicationFilesDirectory] path];

While this is supplied by the template, it's worth noting that the code samples for the book provide that method pointing to a "Grokking_Recipes" folder in the "Application Support" directory, while this one pops that folder right into "Library."--Dru Kepple

#47470: beginSheetForDirectory:file:modalForWindow:... has been depreciated in Xcode 4.2.2. The code as written throws an error that says "implicit conversion of an Objective-C pointer to 'void *' is disallowed with ARC." ah, progress :)--paul adams

#43913: apple doc 'core data programming guide: managed objects' expressly states that overriding the description method is discouraged as the results may be 'unpredictable' if the method fires a fault.
yet, in introductory material here (chapter 3, p35), that is exactly what is offered and further 'With this method, I can reuse it in every NSManagedObject subclass that I create rather than having to create a custom -description method for each subclass.'
its disheartening to think that i will have to check this book against apple's documentation.

#46684: The text describing how to set up the bindings for the search field reads thus:

"...we bind this NSSearchField to our recipe's NSArrayController using the controller key of filterPredicate and a model key path of name."

I couldn't get this to work until I looked at the XIB in the downloadable code. It would appear that setting a Model Key Path is not what you want to do; instead, you want to set the Predicate Format to "name contains $value". I can see how saying "using...a model key path of name" could be interpreted as "using a model key path of name IN THE PREDICATE FORMAT field." But that's far less obvious than explicitly stating what goes into what fields, for us newbies.--Dru Kepple

#47941: The very last line of this page is obscured in the PDF document.
In the .mobi, I can see that the last line says "and we can exit this cycle of the run loop"; however, the pdf ends with "and we can exit".

peering slightly above the blue border at the foot of the pdf page, the tops of the textual characters can be seen.--Mr Mike Abidakun

#41809: Once the versioning of the data model is started the call to pathForResource in managedObjectModel needs to be changed to load a resource of type @"momd"--David Huang

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