CODEWITHSUNDEEP
swiftrealm
user2185354
user2185354

Reputation: 519

Get notified when value in List is updated using realm

I am trying to write an application in OS X using a Realm database. I want to trigger notification when where there is change in value of List which is inside another object

Below is the Class

final class Profile: Object {
    @objc dynamic var gradient1 = ""
    @objc dynamic var gradient2 = ""
    @objc dynamic var fontColor = ""
    @objc dynamic var selectedFont = ""
    @objc dynamic var selectedTitleFont = ""
    @objc dynamic var fontFamily = ""
    @objc dynamic var name = ""
    @objc dynamic var shortbio = ""
    @objc dynamic var avatarSource = ""
    @objc dynamic var userid = ""
    @objc dynamic var email = ""
    var features = List<Features>()
    var socialLinkButtons = List<SocialLinkButtons>()

    @objc dynamic var appSelectedMetaData : AppMetaData? = nil

    override static func primaryKey() -> String?{
        return "userid"
    }

}

final class Features: Object {
    @objc dynamic var uuid = ""
    @objc dynamic var id = ""
    @objc dynamic var label = ""
    @objc dynamic var screen = ""
    @objc dynamic var active = false

    override static func primaryKey() -> String?{
        return "id"
    }

    convenience init(id: String, uuid: String, label: String, screen: String, active: Bool) {
        self.init()
        self.id = id
        self.uuid = uuid
        self.label = label
        self.screen = screen
        self.active = active
    }
}

I want to trigger notifications whenever value inside feature is updated.

Upvotes: 1

Views: 758

Answers (1)

David Pasztor
David Pasztor

Reputation: 54706

You can use Realm Collection Notifications to achieve your goals. You just need to make sure that you store the returned NotificationToken in a variable that doesn't get deallocated until you don't actually need to receive the notifications anymore and that you call .invalidate() on the token when you no longer want to receive notifications.

func observeFeatureChanges(in profile:Profile) -> NotificationToken {
    let notificationToken = profile.features.observe { changes in
        switch changes {
        case .update(_, deletions: let deletionIndices, insertions: let insertionIndices, modifications: let modIndices):
            print("Objects deleted from indices: \(deletionIndices)")
            print("Objects inserted to indices: \(insertionIndices)")
            print("Objects modified at indices: \(modIndices)")
        case .error(let error):
            print(error)
        case .initial(let type):
            print(type)
        }
    }
    return notificationToken
}

Upvotes: 1

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