UITableView doesn't show the realm objects that it should show - ios

Question

I have a problem with the content of a tableView. It doesn't show me the realm objects, that I asked for. Here's my code:
At the top of the class i declared this variable:
let newPlan = TrainingPlan()
Then I have this button action, which is copying the exercise objects, put them in an array an add this to realm. I did this, because I only want to change this copied array:
#IBAction func savePlanAction(_ sender: AnyObject) {
if planNameTextField.text!.isEmpty{
planNameFehlerLabel.isHidden = false
}
else{
newPlan.name = planNameTextField.text!
newPlan.creationDate = NSDate() as Date
let selectedExcercises = loadSelectedExcercises()
if selectedExcercises != nil{
for var i in (0..<selectedExcercises!.count){
excerciseCopies.append(selectedExcercises![i])
do{
try realm.write{
realm.add(excerciseCopies[i])
}
}
catch{
print(error)
}
}
try! realm.write{
realm.add(newPlan)
}
for object in excerciseCopies {
do{
try realm.write{
newPlan.excercises.append(object)
}
}
catch{
print(error)
}
}
performSegue(withIdentifier: "savePlan", sender: self)
}
else{
uebungFehlerLabel.isHidden = false
}
}
}
Then I give the newPlan object to another ViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier! == "savePlan" {
let tct = segue.destination as! TrainingPlanConfTableViewController
tct.plan = newPlan
}
}
Now in the next class I want to show all exercise objects from the copied array in a tableView, but the tableView doesn't show anything:
class TrainingPlanConfTableViewController: UITableViewController {
//Properties
let realm = try! Realm()
var excercisesFromPlan: Results<Excercise>?{
didSet{
tableView.reloadData()
}
}
var plan: TrainingPlan?
//Lifecycle
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
loadExcercisesFromPlan()
}
//Request
func loadExcercisesFromPlan(){
if plan != nil{
let predicate = NSPredicate(format: "trainingsplan = %#", plan!)
excercisesFromPlan = realm.objects(Excercise.self).filter(predicate)
}
}
//Tableview Funktionen
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if excercisesFromPlan != nil{
return excercisesFromPlan!.count
}
return 0
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: TrainingPlanConfTableViewCell = tableView.dequeueReusableCell(withIdentifier: "PlanConfCell") as! TrainingPlanConfTableViewCell
let excercise = excercisesFromPlan![indexPath.row]
cell.nameLabel.text = excercise.name
return cell
}
}
I'm pretty new in Swift and I can't find the issue. Is the predicate seated wrong? I would be thankful for any help! If you need any more information, for example the data model etc, pls feel free to ask

Answer 1

Since you didn't include the code for your models, there's no way to know for sure if your predicate is correct or not.
What I can tell is the TrainingPlan has a exercises property on it that you should use instead of querying for the same thing.
You would just need to change excercisesFromPlan to be a List instead of a Results
var excercisesFromPlan: List<Excercise>?
and change loadExcercisesFromPlan to get it
func loadExcercisesFromPlan() {
excercisesFromPlan = plan?.excercises
}