CoreDataCodable-2.swift

class UserController: UserControllerProtocol {
    [...]

    private let persistentContainer: NSPersistentContainer

    [...]

    init(persistentContainer: NSPersistentContainer) {
        self.persistentContainer = persistentContainer
    }

    [...]
}

private extension UserController {
    func parse(_ jsonData: Data) -> Bool {
        do {
            guard let codingUserInfoKeyManagedObjectContext = CodingUserInfoKey.managedObjectContext else {
                fatalError("Failed to retrieve context")
            }

            // Clear storage and save managed object instances
            if currentPage == 0 {
                clearStorage()
            }

            // Parse JSON data
            let managedObjectContext = persistentContainer.viewContext
            let decoder = JSONDecoder()
            decoder.userInfo[codingUserInfoKeyManagedObjectContext] = managedObjectContext
            _ = try decoder.decode([User].self, from: jsonData)
            try managedObjectContext.save()

            return true
        } catch let error {
            print(error)
            return false
        }
    }

    [...]
}