Realm swift: Empty realm after relaunching app - ios

Question

I started a new project and tried to implement Realm but I can't get it to work properly. My problem is that when I kill my app and relaunch it, all my previously added objects have disappeared and I get empty results from realm.objects.
class RealmManager {
static let shared = RealmManager()
let realm: Realm
init() {
realm = try! Realm()
}
func write(_ completion: ()->Void) {
do {
try realm.write() {
completion()
}
} catch {
print(error)
}
}
func add(_ object: Object) {
realm.add(object)
}
func delete(_ object: Object) {
realm.delete(object)
}
func objects<Element>(_ type: Element.Type) -> Results<Element> where Element : Object {
return realm.objects(type)
}
}
I created this singleton so I don't have to repeat this realm = try! Realm()everywhere in my code. I have this exact same class in another project which works fine.
My model looks like this :
class PrepFile: Object {
#objc dynamic var creationDate: Date = Date()
#objc dynamic var lastModificationDate: Date = Date()
#objc dynamic var title: String = "Pas de titre"
#objc dynamic var activityKind: String = ""
#objc dynamic var seanceNumber: Int = 0
#objc dynamic var level: String = ""
#objc dynamic var duration: Int = 0
#objc dynamic var date: Date = Date()
#objc dynamic var cycle: Int = 0
#objc dynamic var mainGoal: String = ""
#objc dynamic var specificGoal: String = ""
#objc dynamic var material: String = ""
#objc dynamic var isDraft: Bool = true
convenience init(title: String? = nil, activityKind: String? = nil, seanceNumber: Int? = nil, level: String? = nil, duration: Int? = nil, date: Date? = nil, cycle: Int? = nil, mainGoal: String? = nil, specificGoal: String? = nil, material: String? = nil, phases: [Phase] = [], isDraft: Bool = true) {
self.init()
if let tt = title {
self.title = tt
}
if let ak = activityKind {
self.activityKind = ak
}
if let sn = seanceNumber {
self.seanceNumber = sn
}
if let lv = level {
self.level = lv
}
if let dt = duration {
self.duration = dt
}
if let dt = date {
self.date = dt
}
if let cl = cycle {
self.cycle = cl
}
if let mg = mainGoal {
self.mainGoal = mg
}
if let sg = specificGoal {
self.specificGoal = sg
}
if let mt = material {
self.material = mt
}
self.isDraft = isDraft
}
required init() {
}
}
Then in my VC here's what I do :
class PrepFileListViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
lazy var prepFiles: Results<PrepFile> = { RealmManager.shared.objects(PrepFile.self) }()
var completePrepFiles: [PrepFile] = []
var draftPrepFiles: [PrepFile] = []
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
RealmManager.shared.write {
for file in prepFiles {
RealmManager.shared.delete(file)
}
}
RealmManager.shared.write() {
RealmManager.shared.add(PrepFile(title: "Fiche de prep 1"))
RealmManager.shared.add(PrepFile(title: "Fiche de prep 2"))
RealmManager.shared.add(PrepFile(title: "Fiche de prep 3"))
RealmManager.shared.add(PrepFile(title: "Fiche de prep 4"))
RealmManager.shared.add(PrepFile(title: "Fiche de prep 5"))
}
}
override func viewWillAppear(_ animated: Bool) {
prepFiles = RealmManager.shared.objects(PrepFile.self)
completePrepFiles = prepFiles.filter({ !$0.isDraft })
draftPrepFiles = prepFiles.filter({ $0.isDraft })
tableView.reloadData()
}
}
Now when I run this, it works fine. My PrepFile are added to Realm and I retrieve them alright with my RealmManager.shared.objects(PrepFile.self). Now, I comment the part where I delete/add my files in the viewDidLoad and I get nothing. I don't get empty objects from RealmManager.shared.objects(PrepFile.self), I get an empty result like nothing was ever saved there.
What am I doing wrong ?
I am using Xcode 12 and running my app on an iPhone 11 / 13.3 simulator. Realm version is 5.5.0.

Answer 1

Hmm from what I can guess, you either have somewhere else a configuration for realm to be "inMemoryIdentifier" or you do not set the proper configuration with fileURL at beggining of the app.
Configuration local realm: https://realm.io/docs/swift/latest/#realms