How to save a NSArray/NSMutableArray in Core Data

Any class you have which conforms to the NSCoding protocol can be serialized and archived in this way. NSArray/NSMutableArray already conform this protocol. Its important to say that all of objects of the array must conform too.

If you have in your model an entity with a property of type 'Binary Data', you can store in it the array data by doing:

[...]
NSData *arrayData = [NSKeyedArchiver archivedDataWithRootObject:TheArray];
myEntity.arrayProperty = arrayData;
[self saveContext]; //Self if we are in the model class
[...]

Then you can retrieve all the original array info by doing the opposite operation:

[...]
NSMutableArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:anEntity.arrayProperty];
[...]