Pfthb

I'm having trouble with Realm giving me the error that a property of a given name does not exist for my object. But I know it does exist.

I've tried to follow the docs at https://realm.io/docs/swift/latest/#updating-values. I've searched for everything I can think of to find an applicable solution here and elsewhere, but nothing I've found works.

I previously performed a simple migration to just add properties to a different object within the same Realm. I just left the migration block empty and that worked fine. That migration should have set my schema from 0 to 1. If I run this with my schema set to 1 and to check for versions less than 2, it tells me that migration must be run in order to add these properties. The migration is running. I have a print statement for every time it executes. If I set the schema to 2, still checking for less than 2, I get the error for invalid property name for the old properties unless I uncomment them. Then I still get the error for the new properties.

Here's my Realm object. The commented out lines are the old properties I want to migrate from. The Int values are what I'm migrating to.

@objcMembers class Options: Object 

// dynamic var morningStartTime: Date?
// dynamic var afternoonStartTime: Date?
// dynamic var eveningStartTime: Date?
// dynamic var nightStartTime: Date?

 dynamic var morningHour: Int = 7
 dynamic var morningMinute: Int = 0

 dynamic var afternoonHour: Int = 12
 dynamic var afternoonMinute: Int = 0

 dynamic var eveningHour: Int = 17
 dynamic var eveningMinute: Int = 0

 dynamic var nightHour: Int = 21
 dynamic var nightMinute: Int = 0

 dynamic var morningNotificationsOn: Bool = true
 dynamic var afternoonNotificationsOn: Bool = true
 dynamic var eveningNotificationsOn: Bool = true
 dynamic var nightNotificationsOn: Bool = true

 dynamic var firstItemAdded: Bool = false

 dynamic var smartSnooze: Bool = false

 dynamic var optionsKey = UUID().uuidString
 override static func primaryKey() -> String? 
 return "optionsKey"
 

My migration block:

 let config = Realm.Configuration(
 // Set the new schema version. This must be greater than the previously used
 // version (if you've never set a schema version before, the version is 0).
 schemaVersion: 2,

 // Set the block which will be called automatically when opening a Realm with
 // a schema version lower than the one set above
 migrationBlock: migration, oldSchemaVersion in
 // We haven’t migrated anything yet, so oldSchemaVersion == 0

 if (oldSchemaVersion < 2) 

 migration.enumerateObjects(ofType: Options.className(), (newObject, oldObject) in
 let morningStartTime = oldObject!["morningStartTime"] as! Date?
 let afternoonStartTime = oldObject!["afternoonStartTime"] as! Date?
 let eveningStartTime = oldObject!["eveningStartTime"] as! Date?
 let nightStartTime = oldObject!["nightStartTime"] as! Date?

 newObject!["morningHour"] = self.getHour(date: morningStartTime)
 newObject!["morningMinute"] = self.getMinute(date: morningStartTime)

 newObject!["afternoonHour"] = self.getHour(date: afternoonStartTime)
 newObject!["afternoonMinute"] = self.getMinute(date: afternoonStartTime)

 newObject!["eveningHour"] = self.getHour(date: eveningStartTime)
 newObject!["eveningMinute"] = self.getMinute(date: eveningStartTime)

 newObject!["nightHour"] = self.getHour(date: nightStartTime)
 newObject!["nightMinute"] = self.getMinute(date: nightStartTime)
 )
 
 )

getHour and getMinute are just functions I wrote to return an Int for the hour or minute from a Date. In case it's relevant, here they are.

func getHour(date: Date?) -> Int 
 let dateFormatter = DateFormatter()
 dateFormatter.dateFormat = "HH"
 let hour = dateFormatter.string(from: date!)
 return Int(hour)!


func getMinute(date: Date?) -> Int 
 let dateFormatter = DateFormatter()
 dateFormatter.dateFormat = "mm"
 let minutes = dateFormatter.string(from: date!)
 return Int(minutes)!

I know this is not the way to do it, but I made it work by taking a slightly more manual approach to the migration block. I uncommented the old properties in the Options object and changed my migration function to the following:

func migrateRealm() 

 let configCheck = Realm.Configuration();
 do 
 let fileUrlIs = try schemaVersionAtURL(configCheck.fileURL!)
 print("schema version (fileUrlIs)")
 catch 
 print(error)
 

 print("performing realm migration")
 let config = Realm.Configuration(
 // Set the new schema version. This must be greater than the previously used
 // version (if you've never set a schema version before, the version is 0).
 schemaVersion: 2,

 // Set the block which will be called automatically when opening a Realm with
 // a schema version lower than the one set above
 migrationBlock: migration, oldSchemaVersion in
 print("oldSchemaVersion: (oldSchemaVersion)")
 if (oldSchemaVersion < 2) 
 print("Migration block running")
 DispatchQueue(label: self.realmDispatchQueueLabel).async 
 autoreleasepool 
 let realm = try! Realm()
 let options = realm.object(ofType: Options.self, forPrimaryKey: self.optionsKey)

 do 
 try realm.write 
 if let morningTime = options?.morningStartTime 
 options?.morningHour = self.getHour(date: morningTime)
 options?.morningMinute = self.getMinute(date: morningTime)
 
 if let afternoonTime = options?.afternoonStartTime 
 options?.afternoonHour = self.getHour(date: afternoonTime)
 options?.afternoonMinute = self.getMinute(date: afternoonTime)
 
 if let eveningTime = options?.eveningStartTime 
 options?.eveningHour = self.getHour(date: eveningTime)
 options?.eveningMinute = self.getMinute(date: eveningTime)
 
 if let nightTime = options?.nightStartTime 
 options?.nightHour = self.getHour(date: nightTime)
 options?.nightMinute = self.getMinute(date: nightTime)
 
 
 catch 
 print("Error with migration")
 

 
 
 
 )

 // Tell Realm to use this new configuration object for the default Realm
 Realm.Configuration.defaultConfiguration = config

 // Now that we've told Realm how to handle the schema change, opening the file
 // will automatically perform the migration
 _ = try! Realm()

This only worked if I queued it on another thread asynchronously. I imagine if this data had been necessary for my initial view controller, then it probably would have created a race condition that caused the app to crash. Luckily this only appears in a secondary view, so it had time to complete before these values are needed. I guess I'll have to remove the unused properties with an updated Realm schema in a future version of my app.