Cleanest way to save Int Array CoreData Swift 3

Question

I do have a simple Integer Array that I want to save/load to CoreData.

Do you have example of the best way to do both of the methods ?

Thank you!

A simple integer? What does it represent? Because if it has a "real" meaning, you could create an entity for it, and use a one to many relationship, else, your could also save the int, as data (using for example JSON representation, NSCoding), as String (componentsJoinedByString), etc. — Larme
– Larme, Commented Dec 9, 2016 at 12:54
it's an Integer Array that represent "choices history" from QuestionsForm something like that [2, 1, 0, 3, 2, 1, 4, 2, 3, 4...] — Kevin Sabbe
– Kevin Sabbe, Commented Dec 9, 2016 at 13:07
Fastest, but not cleanest way: Declaring CoreData's field as Transformable with [Int] as Custom Class (assuming you set code generation to Swift for the model) will work. CoreData will archive/dearchive data behind offscreen. — user28434'mstep
– user28434'mstep, Commented Dec 9, 2016 at 14:01

RajeshKumar R · Accepted Answer · 2016-12-09 13:51:46Z

3

Create an attribute with type binaryData in your entity. And convert your array to data using

    NSKeyedArchiver.archivedDataWithRootObject(AnyObject)

And convert the array from data using

    NSKeyedUnarchiver.unarchiveObjectWithData(NSData)

By this way you can store any object in core data.

answered Dec 9, 2016 at 13:51

RajeshKumar R

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1 Comment

Been searching and searching for a clean way to save an array. This works really well. Thanks