saving array into realm database swift - swift

Question

I have an application which uses realm database to persist data and everything works fine but the issue I have now is I want to save photo: Data array to the database and I tried using the standard swift array format but got an error at build time. below is my code
class TodoListModel: Object {
#objc dynamic var id = UUID().uuidString
#objc dynamic var photo: Data? = nil
#objc dynamic var createdDate: Date?
override static func primaryKey() -> String? {
return "id"
}
let parentCategory = LinkingObjects(fromType: CategoryModel.self, property: "items")
}
how do I now make the photo into an array
this is the way I create my List
func createTodoList(createdDate: Date, photo: Data) -> Void {
let todoList = TodoListModel()
todoList.createdDate = createdDate
todoList.photo = photo
TodoListFunctions.instance.addData(object: todoList)
}
update model
func updateTodoList(update: TodoListModel, createdDate: Date, photo: Array<Data>) -> Void {
update.createdDate = createdDate
update.photo.append(objectsIn: photo)
}

Answer 1

To be able to store several objects of type Data in a single property of an Object subclass, you need to use List.
class TodoListModel: Object {
#objc dynamic var id = UUID().uuidString
#objc dynamic var createdDate: Date?
let photos = List<Data>()
let parentCategory = LinkingObjects(fromType: CategoryModel.self, property: "items")
override static func primaryKey() -> String? {
return "id"
}
}
Then you can create a TodoListModel instance like this:
func createTodoList(createdDate: Date, photos: Array<Data>? = nil) -> Void {
let todoList = TodoListModel()
todoList.createdDate = createdDate
if let photos = photos {
todoList.photos.append(objectsIn: photos)
}
TodoListFunctions.instance.addData(object: todoList)
}