CoreData Mysterious Conditional Data Loss
CoreData Mysterious Conditional Data Loss
- Subject: CoreData Mysterious Conditional Data Loss
- From: Milen Dzhumerov <email@hidden>
- Date: Thu, 24 Sep 2009 13:38:09 +0100
Hi all,
I'm experiencing the weirdest conditional data loss that I've seen in
a long time. One of my managed objects has an NSImage property (stored
as Transformable). Now here's the bug in summary: If the app bundle
which initially created the persistence file (SQLite or XML) gets
moved, the icon property doesn't get restored. If I move the bundle
back to where it originally was, it gets restored.
Here's an example of what steps I took to reproduce. Imagine we have
the following configuration:
~/Desktop/Folder1/MyApp.app
~/Desktop/Folder2
I launch MyApp for the first time from Folder1 and it all works fine -
icons are drawn in the sidebar, etc. Now I quit it and decide to move
it Folder2 using Finder. I relaunch MyApp from Folder2 and now all the
icons are gone. Quit again, move back to Folder1 and relaunch - icons
are back. In fact, if MyApp is run from any location *except* Folder1,
there are no icons.
I'm really baffled by this and I have no idea how to go about the
problem (considering all the magic happens in the CoreData layers
which I have no way to debug). So I decided to log the object and
property before I draw it.
Case 1 (running from Folder1):
...
icon = "(...not nil..)"; <--- log of the managed object
...
Logging [obj icon] gives:
icon=NSImage 0x15fc7a20 Size={16, 16} Reps=(
NSBitmapImageRep 0x15fe5dc0 Size={16, 16}
ColorSpace=NSCalibratedRGBColorSpace BPS=8 BPP=32 Pixels=16x16
Alpha=YES Planar=NO Format=2 CGImage=0x15fe6510
)
Case 2 (any other folder apart from Folder1):
...
icon = "(...not nil..)";
...
[obj icon] gives:
icon=NSImage 0x15fc7ef0 Size={0, 0} Reps=(
)
Any hints on what might be causing this are greatly appreciated.
M
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