Core Data : No NSValueTransformer with class name XXX was found for attribute YYYY on entity ZZZZ

Question

I have my CoreData model set in a xcdatamodel file.

My attribute YYYY has a type transformable and I set the tranformer name in the Data model inspector.

I my

Answer 1

I spent way to much time on this to not share the solution I found :

I had to make the NSValueTransformer subclass available to Objc.

@objc(LocationArrayTransformer)
class LocationArrayTransformer : NSValueTransformer {
 ....
}

Simple as that.

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As @Sbooth points out, Swift classes are namespaced. Using @objc makes the class available without namespacing. So setting the transformer name as MyApp.Mytransformer works well too !