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I'm completely new in Realm and I'm trying to add some data ty my database. I have a trainings which consist of exercises. Every training has id, date and list of exercises. In my table view i create two trainings and every has it's own id, after that i'm adding some exercises to first one and when i'm trying to add to second one i get an error: "Attempting to create an object of type 'TrainingExercise' with an existing primary key value 'Thruster'." I don't understand why it tries to add this to previous training. I get training by id from database and i checked if the right id is passed to function and that's it. But when i put breakpoint the id of training is previous and i can't understand the reason of this. Could somebody help me to solve this?
Here is my training model:

 class Training: Object 

 @objc dynamic var id = 0
 @objc dynamic var date = NSDate()
 var exercises = RealmSwift.List<TrainingExercise>()

 convenience init(date: NSDate, exercise: TrainingExercise) 
 self.init()
 self.date = date
 self.exercises.append(exercise)
 

 override class func primaryKey() -> String? 
 return "id"
 

Here is my exercise model:

 class TrainingExercise: Object 

 @objc dynamic var name: String = ""
 let sets = RealmSwift.List<GymSet>()


 convenience init(name: String, gymSet: GymSet) 
 self.init()
 self.name = name
 self.sets.append(gymSet)
 

 override class func primaryKey() -> String? 
 return "name"
 


class GymSet: Object 


 @objc dynamic var reps: Int = 0
 @objc dynamic var kilos: Double = 0
 @objc dynamic var time: String = ""

And here's function which i use to add exercises to a training

func addExerciseForTraining(trainingId: Int, exercise: TrainingExercise) 

 let training = getTrainingById(id: trainingId)

 try? database.write 
 training.exercises.append(exercise)
 

 try? database.write 
 database.create(Training.self, value: training, update: true)
 




func getTrainingById(id: Int) -> Training 
 let training = database.object(ofType: Training.self, forPrimaryKey: id)

 return training!

You need to set relationships between your classes right. So, try to replace your classes like this:

class Training: Object 
 @objc dynamic var id = 0
 @objc dynamic var date = NSDate()
 var exercises = List<TrainingExercise>()


class TrainingExercise: Object 
 @objc dynamic var name: String = ""
 var training = LinkingObjects(fromType: Training.self, property: "exercises")
 var sets = List<GymSet>()


class GymSet: Object 
 @objc dynamic var reps: Int = 0
 @objc dynamic var kilos: Double = 0
 @objc dynamic var time: String = ""
 var exercise = LinkingObjects(fromType: TrainingExercise.self, property: "sets")

Now when you want to create new create it like this

let training = Training()

if you want to change any of its property use this for example

try? database.write 
 training.id = 1

and to add your training to database use this

try? database.write 
 database.add(training)