Snippet of start of Core Data class (NSManagedObject subclass) with enough code to make it into a Bindable object

ListContent.swift

public class ListContent : NSManagedObject, BindableObject {
    public let didChange = PassthroughSubject<Void, Never>()
    private var changePublisher: PassthroughSubject<Void, Never> {
        return didChange
    }
    
    override public func didChangeValue(forKey key: String) {
        super.didChangeValue(forKey: key)
        self.changePublisher.send(())
    }