Write to Realm in a loop - ios

Question

I am storing workout information in Realm from this object class:
class Workout: Object {
#objc dynamic var date: Date?
#objc dynamic var name: String?
#objc dynamic var exercise: String?
#objc dynamic var sets = 0
#objc dynamic var reps = 0
#objc dynamic var kg: Double = 0.0
#objc dynamic var notes: String?
}
I have data stored as an array, that I want to write to Realm, like this:
var workoutName = ""
var exercises = [String]()
var sets = [Int]()
var reps = [Int]()
var kg = [Double]()
var notes = [String]()
#IBAction func saveWorkoutButton(_ sender: Any) {
let realm = try! Realm()
print(Realm.Configuration.defaultConfiguration.fileURL!)
let currenDate = Date() // Get the current date
let myWorkout = Workout()
myWorkout.date = currenDate
myWorkout.name = workoutName
for i in 0 ..< exercises.count {
myWorkout.exercise = exercises[i]
myWorkout.sets = sets[i]
myWorkout.reps = reps[i]
myWorkout.kg = kg[i]
myWorkout.notes = notes[i]
realm.add(myWorkout)
}
try! realm.write {
realm.add(myWorkout)
}
}
The problem in this case is that when running the realm.write ... it only adds the last value from the for i in 0 function. I tried putting the realm.write function inside of the for i in 0 loop, but then it crashes. Each of the arrays contains equal numbers of objects. Any ideas?

Answer 1

You can try this code:
var myWorkouts:[Workout] = []
for i in 0 ..< exercises.count {
let myWorkout = Workout()
myWorkout.date = currenDate
myWorkout.name = workoutName
myWorkout.exercise = exercises[i]
myWorkout.sets = sets[i]
myWorkout.reps = reps[i]
myWorkout.kg = kg[i]
myWorkout.notes = notes[i]
myWorkouts.append(myWorkout)
}
try! realm.write {
realm.add(myWorkouts)
}
You should only add and write once if possible for performance optimisation.
Hope this helps.