I am using Core Data to fetch the list of clinics, the clinics has relations named doctors mapped to Doctor entity.
My issue is, every time I fetch doctors, which is of type NSSSet, the record is fetched randomly, I want to sort it alphabetically using Doctor.name
I tried the following
self.doctorList = clinic.doctors?.sortedArray(using: [NSSortDescriptor(key: "name", ascending: true)])
Where am I going wrong?
Thanks.
(NS)Set is an unordered collection type.
To order a Set convert it to an array with the allObjects property and sort the array.
self.doctorList = (clinic.doctors!.allObjects as! [Doctor]).sorted(by: { $0.name < $1.name })
You can even sort the set directly but the result is always an array
self.doctorList = (clinic.doctors as! Set<Doctor>).sorted(by: { $0.name < $1.name })
And if the set is declared as native Set<Doctor> anyway you can omit the type cast.
I recommend to declare the doctors relationship as non-optional. If there is no associated doctor the set is empty. But a clinic without any doctor is very unlikely ;-)