I'm trying to programatically set the initial file url (path,
filename) of an Core Data NSPersistentDocument, or if that is not
possible, at least populate the Save panel with an initial filename.
At first, I was using -[NSDocument
saveToURL:ofType:forSaveOperation:error:]. That worked fine until I
switched from XML to SQLite store, whereupon I began getting "Could
not merge changes" errors when saving [1].
Then, I tried to implement -prepareSavePanel: and in there to
setFileURL: if it is found to be nil, as it is for a new document.
But this results in a "nil is not a valid persistent store" being
logged upon saving. [1]
Then, I tried using -[NSPersistentStoreCoordinator
migratePersistentStore:toURL:options:withType:error:]. But this
results in a crash upon saving, in -[NSDocument
_saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo
:]. [2]
Then, I tried removing the old persistent store with
removePersistentStore:error: and adding a new one with
addPersistentStoreWithType:configuration:nilURL:options:error:. But
that results upon saving in errors such as "The NSManagedObject with
ID:0x16d22cb0 <x-coredata://...> has been invalidated".
For brevity, I have omitted my arguments for and against each of the
four approaches.
What is the correct approach to do programatically set the file URL of
an NSPersistentDocument? Or if someone could rule out one or more of
my four approaches, at least I would know which to not waste any time
beating on :)
Thank you,
Jerry Krinock
[1] In the error's userInfo, in the the 'conflictList', I see that the
newVersion is 0 but the old version is 1. That seems kind of weird
but I'm just guessing...
conflictList:
(
{
cachedRow = {
configureAutomatically = 1;
defaultSortable = 1;
displaysFolders = 1;
doExportAfterSave = <null>;
doFindDupesAfterOpen = <null>;
doImportAfterOpen = <null>;
doOpenAfterLaunch = <null>;
doSortAfterOpen = <null>;
filterIgnoredPrefixes = 0;
hasBar = 0;
hasMenu = 0;
hasOhared = 0;
hasUnfiled = 0;
ignoreDisparateDupes = 0;
lastDupesDone = <null>;
lastDupesMaybeMore = <null>;
lastSortDone = <null>;
lastSortMaybeNot = <null>;
lastTouched = <null>;
lastVerifyDone = <null>;
lastVerifyMaybeNot = <null>;
notes = "Document created 2009 May 17 17:40 by jk.";
rootLeavesOk = 0;
rootNotchesOk = 0;
rootSoftainersOk = 0;
rootSortable = 127;
satchAll1 = 1;
satchAll2 = 1;
softainersAnyRootIndex = 0;
sortBy = 0;
sortFoldersAt = 0;
tagDelimiter = 61441;
uuid = "F1724F28-C8A1-4F92-9334-C1C48721868B";
visitor = visitDB;
};
databaseRow = {
};
newVersion = 0;
object = Bookshig 0x2800630 owned by Bookshelf 0x165ecac0
"untitled_5.bkmslf";
oldVersion = 1;
}
)
[2] Actually, the crash occurs in the next call, -[NSDocument
_willPresentSavingError:forOperation:url:]. I suppose that the 'url'
parameter may be invalid.
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