Saving Array to Realm in Swift

saving array into realm database swift

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)
}

Store array of String in Realm

You cannot store Swift Array to Realm store. Instead of using Array you could make it List<String>. And you can use append(objectsIn:) method.

class Reminder: Object {
  @objc dynamic var name = ""
  @objc dynamic var done = false
  let namesArray = List<String>()
}

Then, simply append new items to the list like this,

let names : [String] = ["Ali","Hammad","Hamza"]
let textFieldReminder = (alertVC.textFields?.first)! as UITextField

let reminderItem = Reminder()       // (8)
reminderItem.name = textFieldReminder.text!
reminderItem.done = false
reminderItem.append(objectsIn: names)

How to save a JSON array to Realm in Swift?

save(todoItem: listArray) doesn't work because save expects an [Object], but listArray is a [TodoListResponse].

What you are missing is the step that converts your codable struct TodoListResponse to the Realm model TodoIItemList. I would write the save method like this:

func save(_ todoListResponses: [TodoListResponse]) {
    do{
        try realm.write{
            for response in todoListResponses {
                let object = TodoIItemList()
                object.title = response.title
                object.completed = response.completed
                realm.add(object)
            }
        }
    }catch{
        print(error)
    }
}

Now save(todoItem: listArray) should work.

If there are many properties that needs to be set in TodoIItemList, you can move the "copying properties" logic to a convenience initialiser of TodoIItemList that initialises a TodoIItemList from a TodoListResponse.

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