On Aug 1, 2010, at 18:31, Jerry Krinock wrote: > When initializing an NSPersistentDocument with sqlite store in a Mac app, I > insert what I call a "singleton" managed object, like the "Department" in > DepartmentAndEmployees. It's simply a container which has a to-many > relationship to its containees (i.e., employees). Delete Rule is Nullify. > > I've reproduced a bug whereupon, during some seemingly unrelated Core Data > operations, this singleton object, which was in the store initially, is gone. > I know this from saving the document, and then dumping the document file > using sqlite3. The related CREATE TABLE and CREATE INDEX statements are > still there, but the singular INSERT INTO statement is gone. > > I tried to break in the debugger when the object disappears, by overriding > -willTurnIntoFault, -didTurnIntoFault, and -validateForDelete:, but none of > these messages are received. > > Sometimes other objects disappear too, and it's possible that the store is > being "hosed" more generally. But, oddly, I don't get even a peep from Core > Data in console. It even loads OK if I close and reopen the document.
Are you sure this isn't just a memory management error, perhaps in combination with an incorrect delete rule? What's the delete rule for the "department" relationship in the "Employee" entity? Is there a strong reference that keeps the singleton "Department" alive even when there's no fetched "Employee" or unfaulted "Employee" in memory? If the disappearance is a result of the singleton being disposed of (for whatever reason), would Instruments' Object Allocations tell you anything about why or when or where the singleton died? _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
