CODEWITHSUNDEEP
iosswiftswift3realm
Udaya Sri
Udaya Sri

Reputation: 2452

Preserving Realm property value when updating object

I'm working on a Swift 3 Realm app and I have this Realm model class: 

class User: Object {
  dynamic var userName = ""
  dynamic var userURL = ""
  dynamic var userThumbnailURL = ""
  dynamic var isRegistered = false

  var userID = RealmOptional<Int>()

  override class func primaryKey() -> String? {
    return "userID"
  }
}

Then I'm adding values as follows. I'm getting them from my server and saving them in the local database:

Query 1

let user = User()
user.userName = fields["userName"] as! String
user.userURL = fields["userURL"] as! String
user.userThumbnailURL = fields["userThumbnailURL"] as! String                    
user.userID.value = fields["userID"] as? Int
try! uiRealm.write {                   
  uiRealm.add(user, update: true)
}

Then when the user finishes the registration I'm updating the specific user in the local Realm database as being a registered user (isRegistered = true). This value is only saved in the local Realm database:

uiRealm.beginWrite()
let updatingUser = uiRealm.objects(User).filter("userID =  %d", self.userId)
let user = updatingUser.first
book?.isRegistered = true        
try! uiRealm.commitWrite()

But my problem is that when the new server response is received and I re-run Query 1 the isRegistered property becomes false. How can I avoid this?

Upvotes: 3

Views: 1222

Answers (1)

bdash
bdash

Reputation: 18308

The short answer is that partial updates of an object cannot be performed by passing an instance of an Object subclass to Realm.add(_:update:). The reason for this is that there's no way to represent don't update this property for a property on your Object subclass. You'll instead want to pass a dictionary to Realm.create(_:value:update:), where the absence of a given key represents don't update this property.

Upvotes: 1

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