swift 3 core data fetch results - macos

Question

i have a core data modal with the entity "Users"
There are two attributes "firstName" and "secondName"
this is actually my code to fetch the results:
var content:[String] = []
func RequestData() {
let appdelegate = NSApplication.shared().delegate as! AppDelegate
let context = appdelegate.persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Kunden")
request.returnsObjectsAsFaults = false
do {
let results = try context.fetch(request)
if results.count > 0 {
for result in results as! [NSManagedObject] {
if let firstname = result.value(forKey: "firstname") as? String {
content.append(firstname)
}
if let secondname = result.value(forKey: "secondname") as? String {
content.append(secondname)
}
}
}
tbl_kunden.reloadData()
} catch {
print("ERROR")
}
}
this works fine.
Problem is. I dont belive that
var content:[String] = []
is the correctly variable to take the results.
Because the output of print(content) is:
["Max", "Mustermann", "Max2", "Mustermann2", "Max3", "Mustermann3"]
Which variable type will be the best for this situation?
i think the result should be something like this:
+ID
++Max
++Mustermann
+ID
++Max2
++Mustermann2
+ID
++Max3
++Mustermann3

Answer 1

You should create custom User objects that are subclasses of NSManagedObject.
https://developer.apple.com/reference/coredata/nsmanagedobject
But if you don't need custom logic, you could change your variable to a Int:[String] Dictionary:
var content:[Int: [String]] = [:]
And append the data like this:
if let id = result.value(forKey: "firstname") as? Int {
let firstName = result.value(forKey: "firstname") as? String ?? "Unknown"
let secondName = result.value(forKey: "secondname") as? String ?? "Unknown"
let user = [id: [firstName, lastName]]
print("Fetched user: \(user.debugDescription)")
}