SwiftUI + Core Data crash when using `.allObjects` of a "To Many" relationship entry

Question

I am constantly getting crash reports with a stack trace like this:

0   libobjc.A.dylib                 0x0000000199e6a334 object_getMethodImplementation + 48 (objc-object.h:97)
1   CoreFoundation                  0x00000001853d35a4 _NSIsNSSet + 40 (NSObject.m:381)
2   CoreFoundation                  0x00000001852a6888 -[NSMutableSet unionSet:] + 108 (NSSet_Internal.h:56)
3   CoreData                        0x000000018b4af3b0 -[_NSFaultingMutableSet willReadWithContents:] + 636 (_NSFaultingMutableSet.m:167)
4   CoreData                        0x000000018b53c3a0 -[_NSFaultingMutableSet allObjects] + 32 (_NSFaultingMutableSet.m:340)

My code is doing the following, this is inside the Core Data auto generated class (I am using the code bellow inside an extension I have made to that class):

if let tasks = tasks?.allObjects as? [Task] {
}

where tasks are @NSManaged public var tasks: NSSet?, this is the "array" object from core data (the auto generated one).

Any ideas what is wrong here, maybe it is a Core Data issue itself, SwiftUI + Core Data for some reason.

Answer 1

This is the way I do it, as a computed property in the class extension, and never had issues.

var allTasks: [Task] {
tasks?.allObjects as? [Task] ?? [ ]
}

you could add the if let inside and do any sorting or filtering and return that.