Swift - Fetching one to many data and displaying it in a tableview - ios

Question

I have two entity:
swimingPool
Parameter
swimming pool has a one to many relation to parameter (each swimming pool has many parameter). I also have an inverse relation
I have saved my data and i fetch the swimming pool in order to display the parameters
Now i'm trying to display them in a tableview. Here's my code:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ParamCell", for: indexPath) as! ParamCell
configureCell(cell: cell, indexPath: indexPath as NSIndexPath)
return cell
}
func configureCell(cell: ParamCell, indexPath: NSIndexPath) {
let swimmingPool = controller.object(at: indexPath as IndexPath)
let parameter = swimminPool.parameters?.allObjects
let paramArray = parameter
for param in paramArray! {
cell.configureCell(parameter: param as! Parameter)
}
}
and here's the number of rows in section
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let sections = controller.sections {
let sectionInfo = sections[section]
if sectionInfo.numberOfObjects > 0 {
return sectionInfo.numberOfObjects
} else {
let noDataLabel: UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: tableView.bounds.size.width, height: tableView.bounds.size.height))
noDataLabel.text = "insert a parameter"
noDataLabel.textColor = UIColor.black
noDataLabel.lineBreakMode = NSLineBreakMode.byWordWrapping
noDataLabel.numberOfLines = 2
noDataLabel.textAlignment = .center
tableView.backgroundView = noDataLabel
tableView.separatorStyle = .none
}
}
return 0
}
This is how i fetch data:
func attemptFetch() {
let fetchRequest: NSFetchRequest<SwimmingPool> = SwimmingPool.fetchRequest()
let dataSort = NSSortDescriptor(key: "swimminPoolCreatedAt", ascending: false)
fetchRequest.sortDescriptors = [dataSort]
let controller = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
controller.delegate = self
self.controller = controller
do {
try controller.performFetch()
} catch {
let error = error as NSError
print("\(error.debugDescription)")
}
} //End AttemptFetch
here's how i manage the different cases:
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
switch(type){
case.insert:
if let indexPath = newIndexPath{
tableView.insertRows(at: [indexPath], with: .fade)
}
break
case.delete:
if let indexPath = indexPath{
tableView.deleteRows(at: [indexPath], with: .fade)
}
break
case.update:
if let indexPath = indexPath{
let cell = tableView.cellForRow(at: indexPath) as! ParamCell
configureCell(cell: cell, indexPath: indexPath as NSIndexPath)
}
break
case.move:
if let indexPath = indexPath{
tableView.deleteRows(at: [indexPath], with: .fade)
}
if let indexPath = newIndexPath{
tableView.insertRows(at: [indexPath], with: .fade)
}
break
}
}
My problem is that the table is displaying just one result randomly(I have inserted 3 parameters)
Any idea?