So I have an app and it relies on Core Data to save and load favourite players. The issue I have is the data being loaded in my viewwillappear method is the max number of all the players regardless whether or not I save the data. When I access my favouritesVC I can't go back and add more players because they take up the max amount of storage. I need my app to retrieve the favourites I saved not all the players.
class FavouritesVC {
//this is a button I save my favourite players
//the print statements are accurate
@IBAction func save(_ sender: UIBarButtonItem) {
let entity = NSEntityDescription.entity(forEntityName: "CurrentPlayers", in: context)!
let saveFav = CurrentPlayers(entity: entity, insertInto: context)
for o in prefArr {
saveFav.yahooName = o.yahooName
saveFav.team = o.team
saveFav.position = o.position
saveFav.photoUrl = o.photoUrl
do {
try context.save()
print("These are my saved objects: \(saveFav)")
print("how many saved objects: \(prefArr.count)")
} catch {
print("error is: \(error)")
}
}
}
}
//what I use to load the data
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let fetchRequest = NSFetchRequest<CurrentPlayers>(entityName: "CurrentPlayers")
do {
prefArr = try context.fetch(fetchRequest)
for p in prefArr {
if p.yahooName == "Jordan *****" {
print("Jordan added")
}
}
print("There are this many saved favourites \(prefArr.count)")
} catch let error {
print("Could not fetch. \(error)")
}
}
}
//core data class file
import Foundation
import CoreData
enum DecoderConfigurationError: Error {
case missingManagedObjectContext
}
extension CodingUserInfoKey {
static let managedObjectContext = CodingUserInfoKey(rawValue: "managedObjectContext")!
}
@objc(CurrentPlayers)
public class CurrentPlayers: NSManagedObject, Decodable {
enum CodingKeys: String, CodingKey {
case photoUrl = "PhotoUrl"
case firstName = "FirstName"
case lastName = "LastName"
case position = "Position"
case team = "Team"
case yahooName = "YahooName"
case status = "Status"
case jerseyNumber = "Jersey"
}
public static var managedObjectContext: NSManagedObjectContext?
required public convenience init(from decoder: Decoder) throws {
guard let context = decoder.userInfo[.managedObjectContext] as? NSManagedObjectContext else {
throw DecoderConfigurationError.missingManagedObjectContext
}
self.init(context: context)
//...
let values = try decoder.container(keyedBy: CodingKeys.self)
photoUrl = try values.decode(String.self, forKey: CodingKeys.photoUrl)
firstName = try values.decode(String.self, forKey: CodingKeys.firstName)
lastName = try values.decode(String.self, forKey: CodingKeys.lastName)
position = try values.decode(String.self, forKey: CodingKeys.position)
team = try values.decode(String.self, forKey: CodingKeys.team)
yahooName = try values.decodeIfPresent(String.self, forKey: CodingKeys.yahooName)
status = try values.decode(String.self, forKey: CodingKeys.status)
jerseyNumber = try values.decodeIfPresent(Int64.self, forKey: CodingKeys.jerseyNumber) ?? 0
}
}
