Iphone Core Data crashing on Save

Question

I\'m currently writing an Iphone application using Core Data and I get a EXC_BAD_ACCESS error during the [managedObjectContext save:&&error] code line.

Answer 1

You are only guaranteed to retain access to a managed object from the context as long as a change is pending to that object (insert, update, delete). As soon as you make a call to save:, you can lose your reference to the managed object.

While you stopped getting the error when you set setRetainsRegisteredObjects:YES, you may have introduced a memory management issue, as you are setting the managed object's lifetime to be dependent on the lifetime of the managed object context. If you're passing your context around throughout your app, this could get rather large if you have a large object hierarchy.

You can read more in the Apple docs here: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdMemory.html.