Not update View when `changesetPublisher` emits a collection changeset - realm

Question

If I have a property in Realm models let book = List<Book>() then its changes do not update the View.
I think it`s because realm models are classes.
Any ideas on how to fix this
final class Book: Object, ObjectKeyIdentifable {
#objc dynamic var id: String = ""
#objc dynamic var title: String = ""
#objc dynamic var subTitle: String = ""
override class func primaryKey() -> String? {
return "id"
}
}
final class Author: Object, ObjectKeyIdentifable {
#objc dynamic var id: String = ""
#objc dynamic var name: String = ""
let book = List<Book>()
override class func primaryKey() -> String? {
return "id"
}
}
class Store: ObservableObject {
#Published var Authors: Results<Author>?
private var subscriptions = Set<AnyCancellable>()
init() {
let realm = try! Realm()
realm.objects(Author.self)
.changesetPublisher
.sink { changeset in
self.applyChangeset(changeset)
}
.store(in: &subscriptions)
}
func applyChangeset(_ changes: RealmCollectionChange<Results<Author>>) {
switch changes {
case .initial(let results):
self.Authors = results
case .update(let results, deletions: _, insertions: _, modifications: _):
self.Authors = results
case .error(let error):
print(error.localizedDescription)
}
}
}

Answer 1

Try to dispatch on main queue, as
realm.objects(Author.self)
.changesetPublisher
.receive(on: DispatchQueue.main) // << here !!
.sink { [weak self] changeset in
self?.applyChangeset(changeset) // avoid cross reference
}
and explicitly notify about changes, because you work with reference-type models, so changing internals does not change reference itself... so
func applyChangeset(_ changes: RealmCollectionChange<Results<Author>>) {
switch changes {
case .initial(let results):
self.Authors = results
case .update(let results, deletions: _, insertions: _, modifications: _):
self.Authors = results
// let assume we consider this case, then
self.objectWillChange.send() // << this !!
case .error(let error):
print(error.localizedDescription)
}
}