Retrieve Realm Object by Primary Key fails on iOS with Swift 3 - ios

Question

I recently upgraded my iOS Project to Swift 3 and iOS 10. Since then I'm running into a weird problem with Realm.
Here is what I try to do: I have a set of Positions, which I want to update with Server Data. So for every existing Position, I want to update it if there exists a newer version. If there is a Server Position, which doesn't exist locally, then I add it.
Here is the Code for that:
let newPositions = serializePositions(jsonResponse)
for newPosition in newPositions {
if let existingPositon = uiRealm.object(ofType: Position.self, forPrimaryKey: newPosition.id as String) {
if (progress.learningVersion < serverLearningVersion) {
try! uiRealm.write {
existingPositon.rank = newPosition.rank
existingPositon.starred = newPosition.starred
}
}
} else {
try! uiRealm.write {
progress.positions.append(newPosition)
}
}
}
If I run this, the something weird happens:
For the firstItem in the loop (the first Position) it works correctly.
But then for the following Positions I get nil for existing Positions, even if it exists.
The Primary Key in the Position Model is a String Field and I use MongoDB Object Ids from the Server.
This is how the Positions are serialized from JSON:
func serializePositions(_ json: JSON) -> List<Position> {
let positions = List<Position>()
let serverPositions = json["positions"].arrayValue
for serverPosition in serverPosition {
let position = Position()
position.id = listItem["id"].stringValue
position.starred = listItem["starred"].boolValue
position.rank = listItem["version"].intValue
positions.append(position)
}
return positions
}
I'm pretty new to Realm and iOS and I hope, that I just make a stupid little mistake here. Thanks in advance for every idea..
Cheers,
Raffi

Answer 1

I discovered the issue. I simply closed a for loop at the wrong position. As the issue was not related to Realm or JSON in the end I don't post the changes. Really it dosnt't help nobody :)