Tree hierarchy data [users => session => results]

Question

Still new to xcode, please excuse any errors or misunderstanding, i hope being the clearest possible

I have a user list containing some usernames (user1, user2, user3...). I saved this list in a NSMutableArray that i get by NSUserDefaults.

Now, in my app, each user is going to create his own one or several sessions. And each session will save one or several results.

I can't post any image so this is a simple way to represent what i want :

  user1 

session 1 session 2

result1 (session1) // result1 (session2)

result2(session1) // result2(session2)

result3 (session1)

I tried to find out some methods or something like that but maybe my key words are not enough pertinent. What will be the best solution to do that ?

I was thinking using a NSMutableArray saving all the session for each user in a NSUserDefaults with objectForKey the name of the user (and the same thing for the results except setting objectForkey the name of the session) but i think it is gonna be very tough and long...

Thank you guys !!!!

Answer 1

For any sort of complex data with relationships you should move on to using CoreData. NSUserDefaults really excels when having simple key-value pairs, but nothing more.

It's a bit of a learning curve to get into it, but once it's set up, you'll understand why it's better to go this way.

CoreData Programming Guide