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Re: Core Data app saving zero length files

Subject: Re: Core Data app saving zero length files
From: mmalc crawford <email@hidden>
Date: Fri, 2 Nov 2007 02:22:54 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden


On Nov 1, 2007, at 10:44 PM, Simon Fell wrote:

I've been able to re-pro this with a bare bones core data document app for the both the XML store and the binary store, the SQLLite store seems to be ok. You can download the re-pro case from http://www.pocketsoap.com/osx/emptyFile.zip run it, enter some text, select save, and choose either XML or binary format. look at the file, it'll be fine. now select save again, now the file will be 0k long. (radar #/5575683)

That appears to be a genuine, rather unpleasant, bug. Thanks for the report.

A trivial workaround for now would probably be simply to implement:


@implementation MyDocument

- (IBAction)saveDocument:(id)sender
{
    if ([[self managedObjectContext] hasChanges])
    {
	[super saveDocument:sender];
    }
}

This will at least prevent the user saving twice and triggering the bug. Perhaps also:

- (BOOL)validateUserInterfaceItem:(id < NSValidatedUserInterfaceItem >)item { if ([item action] == @selector(saveDocument:)) { if ([[self managedObjectContext] hasChanges]) { return YES; } return NO; } return [super validateUserInterfaceItem:item]; }


mmalc

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References:
	>Core Data app saving zero length files (From: Simon Fell <email@hidden>)
	>Re: Core Data app saving zero length files (From: Simon Fell <email@hidden>)

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