Using SwiftUI, Core Data, and one-to-many relationships, why does the list not update when adding a row on the Many side

Question

I have a SwiftUI project with Core Data. The data model is a simple one-to-many and two primary views which each have a textfield at the top and a button to add a new item to th

Answer 1

After more research, ObservableObject has a built-in publisher by default that can notify any views that the object will change. Simply call

objectWillChange.send()

on an ObservableObject before changes occur to have any UI refresh that is observing that object.

For example, to fix my issue where changes to Core Data relationships weren't updating the UI, I've added this call before saving the context.

if workContext.hasChanges {
    objectWillChange.send()
    do {
        try self.workContext.save()
    } catch {
        fatalError(error.localizedDescription)
    }
}

No need to implement a custom @Published property or other workaround.