How to compare two values in Realm Swift - swift

Question

I have a Realm database called NewsCount. I need to download a new news only if there is a new news (respectively when newsCount change). And I make a comparison with the data parsing. But I can not compare them properly. How do you compare them?
Thi is my code
private func parseJSONData(_ data: Data) {
do {
let temp: NSString = NSString(data: data, encoding: String.Encoding.utf8.rawValue)!
let myNSData = temp.data(using: String.Encoding.utf8.rawValue)!
guard let jsonResult = try JSONSerialization.jsonObject(with: myNSData, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary else {
return
}
guard let jsonNews = jsonResult["categories"] as? [AnyObject] else {
print("Empty array")
return
}
let realm = try Realm()
let category = realm.objects(NewsCount.self)
var array = [Int]()
for i in category {
array.append(i.newsCount)
}
print(array)
print("News COUNT2 \(category)")
for jsonnewes in jsonNews {
let newsJson = NewsCount()
//HERE I COMPARE
if !UserDefaults.standard.bool(forKey: "AppStarted") || jsonnewes["count"] as! Int > array[jsonnewes as! Int]{
newsJson.newsID = jsonnewes["term_id"] as! Int
newsJson.newsCount = jsonnewes["count"] as! Int
//print("News COUNT2 \(newsJson.newsCount)")
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "downloadNew"), object: nil)
} else {
newsJson.newsID = jsonnewes["term_id"] as! Int
newsJson.newsCount = jsonnewes["count"] as! Int
//print("News COUNT3 \(newsJson.newsCount)")
}
insertOrUpdate(newsJson)
}
} catch {
print(error)
}
}

Answer 1

Because Realm uses RealmOptional to use Int values you have to call the value atribute to the RealmOptional
Try change this:
for i in category {
array.append(i.newsCount.value)
}

Answer 2

First off, it's probably more appropriate to use Int(string) instead of as! Int force-casting to convert your JSON data to integers.
From the looks of it, jsonnewes is a dictionary full of JSON data, but you're casting it as an array index in array[jsonnewes as! Int] which (given array is an array and not a dictionary) shouldn't work.
Instead, in order to make sure you're explicitly retrieving the item you want, I'd recommend using Realm's primary key query method in order to retrieve the item you want.
let realm = try! Realm()
for newsItem in jsonNews {
let newsPrimaryKey = Int(newsItem)
let realmNews = realm.object(ofType: NewsCount.self, forPrimaryKey: newsPrimaryKey)
// Don't continue if a Realm object couldn't be found
guard let realmNews = realmNews else {
continue
}
// Perform comparison
if Int(newsItem["count"]) > realmNews.newsCount {
// Perform the update
}
}