NSNull handling for NSManagedObject properties values

Question

I\'m setting values for properties of my NSManagedObject, these values are coming from a NSDictionary properly serialized from a JSON file. My problem

Answer 1

It might be a little easier if you wrap this in a macro:

#define NULL_TO_NIL(obj) ({ __typeof__ (obj) __obj = (obj); __obj == [NSNull null] ? nil : obj; })

Then you can write things like

fight.winnerID = NULL_TO_NIL([dict objectForKey:@"winner"]);

Alternatively you can pre-process your dictionary and replace all NSNulls with nil before even trying to stuff it into your managed object.