Xcode Question posted in
Whether you're new to Xcode or an experienced developer, our archive has everything you need to know about this integrated development environment (IDE). From basic functionalities to advanced features, our archive covers a wide range of Xcode-related questions and answers. Browse our archive now and find solutions to your Xcode questions, and take your app development skills to the next level

Xcode – 'Diary' does not have a primary key and can not be updated

I am making a diary app with Realm Swift and FSCalendar.
When I press the button to add to Realm, the app crashes and the title message is displayed.
Realm Swift is update 10.2.0.
I am testing it on an actual machine.
I deleted the application of the actual machine and installed it.
Do you know the solution?
Xcode12.2 mac11.0.1

import UIKit
import RealmSwift

class PrimaryData: Object {
    @objc dynamic var id: Int = 0
    @objc dynamic var Diary: String = ""
    override static func primaryKey() -> String? {
        return "Diary"
    }
}

    @IBAction func didTapAddNoteButton(_ sender: Any) {
        let realm = try! Realm()
        let diary = Diary()
        diary.date = date
        
        try! realm.write {
            realm.add(diary, update: .modified)
        }
        
        self.performSegue(withIdentifier: "toSegueViewController", sender: nil)
        
    }

import UIKit
import RealmSwift

class Diary: Object {
    
    @objc dynamic var date: String = ""
    @objc dynamic var context: String = ""
    
    open var primaryKey: String {
        return "date"
    }

}
Tags:

2

Answers


  1. 0

    AppDelegate in Migration Code because app not delete when changes in model anythings.

    Please update pod and re-install

    pod ‘ObjectMapper’
    pod ‘RealmSwift’

    Migration Datababse if changes in Module add or remove Object than schemaVersion increment static

    var config = Realm.Configuration.defaultConfiguration
config.schemaVersion = 5
config.migrationBlock = { migration, oldSchemaVersion in }
Realm.Configuration.defaultConfiguration = config

    MVVM Structure

    Create a Notification Model

    import UIKit
import RealmSwift
import ObjectMapper


public class NotificationResults:Object,Mappable{
    @objc dynamic var status:Int = 0
    @objc dynamic var message:String = ""
    @objc dynamic var current_page:Int = 0
    @objc dynamic var per_page:Int = 0
    var data  : [String : Any] = [:]
    var notificationData = List<NotificationModel>()
    
    /// Primary Key
    public override static func primaryKey() -> String? {
        return "status" /* you can use like id,staus,message..etc..*/
    }
    /// Init Map
    required convenience public init?(map: Map) {
        self.init()
    }
    /// Mapping
    public func mapping(map: Map) {
        status <- map["status"]
        message <- map["message"]
        current_page <- map["data.current_page"]
        per_page <- map["data.per_page"]
        notificationData <- (map["data.data"], ArrayTransform<NotificationModel>())
        
    }
    
}
class NotificationModel: Object,Mappable {
   @objc dynamic var id:Int = 0
   @objc dynamic var title:String = ""
   @objc dynamic var message:String = ""
   @objc dynamic var datetime:String = ""
   /// Primary Key
   public override static func primaryKey() -> String? {
       return "id"
   }
   /// Init Map
   required convenience public init?(map: Map) {
       self.init()
   }
   /// Mapping
   public func mapping(map: Map) {
       id <- map["id"]
       title <- map["title"]
       message <- map["message"]
       datetime <- map["published_at"]
   }
}
    Login or Signup to reply.
  2. 0

    The issue is that your Diary object does not have a primary key, so this will fail

    realm.add(diary, update: .modified)

    From the documentation

    If your model class includes a primary key, you can have Realm
    intelligently update or add objects based off of their primary key
    values using Realm().add(_:update:).

    To fix, add a primary key to your Diary object

    class Diary: Object {
   @objc dynamic var _id = UUID().uuidString

   override static func primaryKey() -> String? {
       return "_id"
   }
}

    Please note that if you’re ever going to sync using MongoDB Realm, then you must name your primary key _id. See the documention which states

    To work with Realm Sync, your data model must have a primary key field
    called _id. _id can be of type string, int, or objectId.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search