Stack overflow when defining subscript on CKRecord in Swift

Question

This question asks whether one can use subscripting with CKRecord in Swift. While I already knew how to do what the questioner wanted, every permutation of it g

Answer 1

Here’s a simple extension to CKRecord to make it easier to subscript with.

extension CKRecord {
    struct Sub {
        let record: CKRecord

        subscript(key: String) -> CKRecordValue? {
            get {
                return record.objectForKey(key) as? CKRecordValue
            }
            set {
                record.setObject(newValue, forKey: key)
            }
        }
    }

    var sub: Sub {
        return Sub(record: self)
    }

    var