swift element is empty - swift

Question

I am trying to get the first or current exercise from my core data but swift keeps telling me that the element is empty. When i run the app and set the break points the debugger shows that the element is empty but no errors. here are the functions i am using to get the element data.
func currentWorkout() -> Workout? {
let client = currentClient()
return (appointment?.workouts as? Set<Workout>)?.first(where: { $0.client == client })
}
private func currentCard() -> Card? {
return currentWorkout()?.card
}
private func currentClientPlannedExercises() -> [ExerciseInfo] {
if let currentCard = currentCard(), let template = currentCard.template, let exerciseSets = template.exerciseSets?.array as? [ExerciseSet] {
let numCardsWithThis = (template.cardsWithThisTemplate as? Set<Card>)?.filter { $0.client != currentClient() }.count ?? 0
let exercsiseSetNumber = numCardsWithThis % exerciseSets.count
if let result = exerciseSets[exercsiseSetNumber].exercises?.array as? [ExerciseInfo] {
return result
}
}
return [ExerciseInfo]()
}
private func currentExercise() -> Exercise? {
// we can't have an exercise without a selection
guard let selectedExercise = currentExerciseInfo(), let currentCard = currentCard() else{
return nil
}
// get the first exercise on the current card that has the same exercise info as the one selected
if let exercises = currentWorkout()?.exercises as? Set<Exercise>{
return exercises.first(where: { $0.exerciseInfo == selectedExercise })
}
let exercise = Exercise(context: context)
exercise.workout = currentWorkout()
exercise.exerciseInfo = selectedExercise
//TODO: Set Seat
return exercise
}
private func currentExerciseInfo() -> ExerciseInfo? {
guard let selectedRow = exercisesTableView.indexPathForSelectedRow else {
return nil
}
return currentClientPlannedExercises()[selectedRow.row]
}

Answer 1

if the Issue is fetching then You can use this Code:
For Fetching the data from Core Data
var tasks: [Task] = [] //Your Entity Name in Bracket
func getData() {
do {
tasks = try context.fetch(Task.fetchRequest()) //Instead of Task your Entity Name
} catch {
print("Fetching Failed")
}
}
And use it like:
for data in tasks{
print(data.name) // All the Attributes name after data.attributename
print(data.address)
}
If it is in tableView:
let data = tasks[indexPath.row]
print(data.name)
You will get the data if it is there.
Edit to Check if Data entered or not
Print the Path like this:
let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
print(paths[0])
Go to sqlite file and open and check if there is Data or not inside that.
Edit If you are facing the issue in Adding Data to Core Data
Simple code to add Data
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let task = Task(context: context) //Entity Name here instead of Task
task.name = taskTextField.text! // Attribute name here after task.attributename
// Save the data to coredata
(UIApplication.shared.delegate as! AppDelegate).saveContext()
Hope this help.

Answer 2

I found the issue was in the currentExercise function it wasn't calling the first exercise until the it had an exercise. I fixed by rewriting the function
private func currentExercise() -> Exercise? {
// we can't have an exercise without a selection
guard let selectedExercise = currentExerciseInfo() else{
return nil
}
// get the first exercise on the current card that has the same exercise info as the one selected
if let exercises = currentWorkout()?.exercises as? Set<Exercise>, let firstExercise = exercises.first(where: { $0.exerciseInfo == selectedExercise }) {
return firstExercise
}
let exercise = Exercise(context: context)
exercise.workout = currentWorkout()
exercise.exerciseInfo = selectedExercise
//TODO: Set Seat
return exercise
}