How to keep entity properties data after save it on core data

Question

I'm creating an entity of UserEntity:

    let userEntity = UserEntity(context: managedContext)

    userEntity.username = user.username
    userEntity.name = user.name
    userEntity.personCode = user.personCode
    userEntity.personalData = XMLRegistrationData.toEntity(userPersonalData: user.registrations.registrationData)

and saving it on this property "loggedUser":

            let loggedUser = XMLUserData.toEntity(user: xmlUserData)
            print(loggedUser) // first print

            do {
                try self.context.save()

                print(loggedUser) // second print
            } catch {
                ...
            }

The first print results on this:

<UserEntity: 0x282b07a70> (entity: UserEntity; id: 0x28081c460 <x-coredata:///UserEntity/t78B51567-8104-4232-9BEA-062FBCB3CEEC3> ; data: {
    activeSession = nil;
    name = "FOO";
    personCode = 000;
    personalData = "0x280828020 <x-coredata:///UserPersonalDataEntity/t78B51567-8104-4232-9BEA-062FBCB3CEEC4>";
    username = 001;
})

But the second print result on this:

<UserEntity: 0x282b07a70> (entity: UserEntity; id: 0xd000000000840002 <x-coredata://C833ECD4-5D54-48C3-9860-B2E0781D08EC/UserEntity/p33> ; data: <fault>)

The UserEntity attributes is nil after saving it on the core data. The object is saved on the core data, I can fetch it using context.fetch, but loggedUser is changed.

Why that occurs? And how can I keep the data on loggedUser after it's saving, not needing to fetch it from core data after save it?

Answer 1

It's not nil it's a fault . The data are still there. You can prove it by printing loggedUser.username

Faulting reduces your application's memory usage by keeping placeholder objects (faults) in the persistent store.