How do I implement a repository pattern over Core Data in Swift?

The repository pattern is a design pattern that provides a way to encapsulate the logic required to access data sources. By implementing a repository pattern over Core Data in Swift, you can separate your data access logic from your business logic, making your codebase cleaner and more maintainable.

Below is an example of how to implement a basic repository pattern for Core Data:


    import Foundation
    import CoreData

    // Protocol defining the methods of the repository
    protocol UserRepositoryProtocol {
        func fetchAllUsers() -> [User]
        func saveUser(name: String, age: Int)
    }

    // CoreData Entity class
    @objc(User)
    public class User: NSManagedObject {
        @NSManaged public var name: String?
        @NSManaged public var age: Int16
    }

    // Implementation of the repository
    class UserRepository: UserRepositoryProtocol {
        let context: NSManagedObjectContext

        init(context: NSManagedObjectContext) {
            self.context = context
        }

        func fetchAllUsers() -> [User] {
            let request: NSFetchRequest = User.fetchRequest()
            do {
                return try context.fetch(request)
            } catch {
                print("Error fetching users: \(error)")
                return []
            }
        }

        func saveUser(name: String, age: Int) {
            let user = User(context: context)
            user.name = name
            user.age = Int16(age)

            do {
                try context.save()
            } catch {
                print("Error saving user: \(error)")
            }
        }
    }

How do I implement a repository pattern over Core Data in Swift?

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How do I implement a repository pattern over Core Data in Swift?

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