Clash Royale CLAN TAG

Cannot fetch the entries of core data

I have below code that it will populate the core database with entries from struct array.
When I debug it seems that is sending correctly the data to the func iterateCoreData, but when I try to fetch the result I don't get anything.

What it could possible be wrong that either not add the data to database or couldn't fetch them.

I have tried the main syntax of saving and fetching with a plain array it works correctly.

let managedObjectContext = self.persistentContainer.viewContext

// this is the working method to save data to core data and then fetch it.
/*
guard let entity = NSEntityDescription.entity(forEntityName: "Journal", in: managedObjectContext) else {
fatalError("There is no such entity!")
}

for id in journalNoteArray.id {
let data = NSManagedObject(entity: entity, insertInto: managedObjectContext)

data.setValue(id, forKey: "id")
}

let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Journal")

do {
if let results = try managedObjectContext.fetch(fetchRequest) as? [NSManagedObject] {
for result in results {
if let id = result.value(forKey: "id") as? Int {
print("the id is: (id)")
}
}
}
} catch {
print("there was an error fetching the results")
}
*/

let journalMirror = Mirror(reflecting: journalNoteArray)

for journal in journalMirror.children {

self.iterateCoreData(givenArray: (journal.value as? Array)!, recEntity: "Journal", recKey: journal.label!)

}

let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Journal")

do {
if let results = try managedObjectContext.fetch(fetchRequest) as? [NSManagedObject] {
for result in results {
if let id = result.value(forKey: "id") as? Int, let date = result.value(forKey: "date"), let journal = result.value(forKey: "journal") {
print("the id is: (id) created on date: (date) with note: (journal)")
}
}
}
} catch {
print("there was an error fetching the results")
}


}


and the iterateCoreData func is the below:

func iterateCoreData(givenArray: Array<Any>, recEntity: String, recKey: String) {

let managedObjectContext = self.persistentContainer.viewContext

guard let entity = NSEntityDescription.entity(forEntityName: recEntity, in: managedObjectContext) else {
fatalError("There is no such entity!")
}

for entry in givenArray {
let data = NSManagedObject(entity: entity, insertInto: managedObjectContext)

print(recKey, entry)
data.setValue(entry, forKey: recKey)
}

}


The issue is that I need to save on the database row by row and not as attribute per attribute for each entity. How I could resolve this?

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