Thanks Ben
One of the other things I had been working on must have fixed the underlying
problem, and my implementation of identifier and setIdentifier were actually
causing this issue. I completely removed those two methods (which is of course
going directly against the documentation at the top of the NSAtomicStore class
reference, but going along with the implication in NSPersistentStore that you
don't have to override it) and for the first time, was able to "save as"! Yay!
But my elation was short lived because I now get an intermittent error on save
as:
Error Domain=NSCocoaErrorDomain Code=4 UserInfo=0x11e9c21c0 "The document
“Untitled60.nm5” could not be saved as “Untitled60sa.nm5”. The folder doesn’t
exist." Underlying Error=(Error Domain=NSCocoaErrorDomain Code=4
UserInfo=0x11ef217f0 "The folder “(null)” doesn’t exist." Underlying
Error=(Error Domain=NSPOSIXErrorDomain Code=2 "The operation couldn’t be
completed. No such file or directory"))
So sometimes it works and sometimes it doesn't. My file format is a zipped
folder with my XML files and other resources in it, so when a file is saved, I
create a temporary folder and put all the bits of my file into it, zip it up,
and then remove the old file and move the zipped up new one into place. I'm not
sure if this is relevant at all, but when I get the save error, it also says:
AppKit called
rmdir("/private/var/folders/nl/nlcXN-oPHJiAXXc1Z0R5VE+++TI/TemporaryItems/(A
Document Being Saved By NovaMind5TP 71)"), it didn't return 0, and errno was
set to 66.
But I am collecting the error messages in my app, and it's not anywhere in
there, so must be from within CoreData, and the man page for rmdir just said
that the return on error is >0 for errors, so I can't be certain what the error
code means (I suspect it means that the folder is not empty).
Has anyone else seen that one before?
I also have a problem where the save as only appears to save some of the data
in my file, but I am guessing that that must be some bug in my code.
If I open a file and then try to "save as" (without making any changes), then I
get a "Could not merge changes" error message. I'm not sure if that's related
to the problem where it is only saving part of the file, or is something
completely different, but am planning to look at the data loss one first and
see if it resolves the merge issue.
Regards
Gideon
On 15/03/2010, at 8:30 AM, Ben Trumbull wrote:
> That particular function is trying to CFRetain the result of -identifier on
> your store. If you've overridden it, make sure it never returns nil and it
> always returns the same UUID at least until someone calls -setIdentifier. The
> UUID should also be set in the store's metadata with the key NSStoreUUIDKey.
> If you're not preserving the store metadata, including any keys Core Data
> might set, then you'll have these kinds of problems.
>
> - Ben
>
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