Convert NSManagedObjects into structs in a "generic" way (Swift) - ios

Question

I have a CoreDataStore class which has two generic placeholders and can be used for each entity type in the model. The idea is that it fetches an NSManagedObject subclass (based on one of the generic types) from the store, converts it into the appropriate object (based on the other generic type) and returns that object.
The purpose of this behaviour is so I'm keeping the Core Data aspects encapsulated and avoiding passing NSManagedObject instances all around the app.
Example potential usage
This is purely how the usage might look to further demonstrate what I am trying to achieve.
let personStore = CoreDataStore<ManagedPerson, Person>()
let personData = personStore.fetchSomeObject() // personData is a value type Person
I have the following code, separated over several files but shown here in a modified fashion for simplicity.
import Foundation
import CoreData
// MARK: - Core Data protocol and managed object
protocol ManagedObjectProtocol { }
class ManagedPerson: NSManagedObject, ManagedObjectProtocol {
var title: String?
}
class ManagedDepartment: NSManagedObject, ManagedObjectProtocol {
var name: String?
}
// MARK: - Simple struct representations
protocol DataProtocol {
typealias ManagedObjectType: ManagedObjectProtocol
init(managedObject: ManagedObjectType)
}
struct Person {
var title: String?
}
struct Department {
var name: String?
}
extension Person: DataProtocol {
typealias ManagedObjectType = ManagedPerson
init(managedObject: ManagedPerson) {
self.title = managedObject.title
}
}
extension Department: DataProtocol {
typealias ManagedObjectType = ManagedDepartment
init(managedObject: ManagedDepartment) {
self.name = managedObject.name
}
}
class CoreDataStore<ManagedObject: ManagedObjectProtocol, DataObject: DataProtocol> {
func fetchSomeObject() -> DataObject {
var managedObject: ManagedObject // fetch an NSManagedObject
// Error here
return DataObject(managedObject: managedObject)
}
}
The error I am receiving is when I try to initialise the struct in fetchSomeObject:
Cannot invoke initializer for type 'DataObject' with an argument list of type '(managedObject: ManagedObject)'
Obviously the compiler can't figure out that the DataObject (which is restricted to types conforming to DataProtocol) can be initialised with a ManagedObject (which is restricted to types conforming to ManagedObjectProtocol) despite it being declared as such in DataProtocol.
Is there any way to achieve this functionality? Additionally is this a reasonable approach or am I completely off the wall with this?
Update
After a bit of digging it seems that Swift generics are invariant which I believe is causing what I'm running into.

Answer 1

Think your CoreDataStore again, for example, CoreDataStore<ManagedPerson, Department> doesn't make any sense. Why not? Because the Department is a DataProtocol without problem, but its corresponding typealias ManagedObjectType is not ManagedPerson.
The reason why your code won't compile is just the same. Here return DataObject(managedObject: managedObject) you can't initialize an DataObject from an armbitary ManagedObject, only a DataObject.ManagedObjectType is acceptable.
So what you need is a type constraint, add this where clause, your code should work:
class CoreDataStore<ManagedObject: ManagedObjectProtocol, DataObject: DataProtocol
where DataObject.ManagedObjectType == ManagedObject>