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Migrate Realm 2.x List of Object to Realm 3.x List of String (or other primary type)


Migrate Realm 2.x List of Object to Realm 3.x List of String (or other primary type)

By : Ishuk Choudhary
Date : November 20 2020, 03:01 PM
With these it helps Realm 3.0 introduces List of primitives types (String, Int, …). , You will need to convert the list of Cities to a list of Strings:
code :
if oldSchemaVersion < 2 {
  migration.enumerateObjects(ofType: Map.className(), { (oldObject, newObject) in
    newObject!["cities"] = (oldObject!["cities"] as! List<MigrationObject>).value(forKey: "name")
  })
}


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Realm: what happens if we update primary key of a realm object?

Realm: what happens if we update primary key of a realm object?


By : yogijerry
Date : March 29 2020, 07:55 AM
Does that help In your source code, the user actually is still standalone object after calling realm.copyToRealm(user).
You should give the return value to user like user = realm.copyToRealm(user);, then the user will be managed by Realm.
Realm Migration: Migrate an object into a List

Realm Migration: Migrate an object into a List


By : abdu
Date : March 29 2020, 07:55 AM
Any of those help So, I've been trying to migrate my Realm schema, but I can't seem to do the following. , You can run a migration block under Realm Configuration.
code :
Realm.Configuration.defaultConfiguration = Realm.Configuration(
schemaVersion: 2,
migrationBlock: { migration, oldSchemaVersion in

    migration.enumerate(Period.className()) { oldObject, newObject in
        // filter the versions where this change would take place
        // if oldSchemaVersion < 1 {
        // }...
        newObject["weekdays"] = [oldObject["weekday"]]              
   })
Realm - Inner realm list object is not updated after copyToRealmOrUpdate()

Realm - Inner realm list object is not updated after copyToRealmOrUpdate()


By : Louis zhang
Date : March 29 2020, 07:55 AM
help you fix your problem Ehm no realm doesn't work this way. I don't really know how it interacts with lists but try the first solution, if it doesn't work the second one will definitely do:
1.
code :
 realm.executeTransaction(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
        RealmList<Message> nestedMessages = initialMessage.getNestedMessages();
        newMessage = realm.copyToRealmOrUpdate(newMessage);
        nestedMessages.add(newMessage); 
    }
 });
RealmList<Message> nestedMessages = new RealmList<Message>();
RealmList<Message> oldMessages = initialMessage.getNestedMessages();
for(Message message: oldMessages){
    nestedMessages.add(message);
}
newMessage = realm.copyToRealmOrUpdate(newMessage);
nestedMessages.add(newMessage);
initialMessage.setNestedMessages(nestedMessages);
realm.copyToRealmOrUpdate(initialMessage);
User made from Realm object has same Primary Key Realm

User made from Realm object has same Primary Key Realm


By : Ray
Date : March 29 2020, 07:55 AM
it helps some times Realm is an object database, so you need to create a new object every time:
code :
try! realm.write {

    user = User() // Create a new user instance

    user.userName = userNameTextField.text!
    user.passWord = passWordTextField.text!
    user.email = emailTextField.text!
    user.name = fullNameTextField.text!
    user.age = ageTextField.text!
    user.id = UUID().uuidString

    realm.add(user)

}
Transform object to list[object] in Realm ( How can i replace a list[objects] with object field in Realm? )

Transform object to list[object] in Realm ( How can i replace a list[objects] with object field in Realm? )


By : maleficarium
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I created new issue in Realm GitHub then i found right way for transform object to list[object] in Realm and insert existing object from previous version to new version of application.
In this example we want to transform Token object to tokenList[Token] in Bank model.
code :
public class RealmMigration implements io.realm.RealmMigration {

.

.

.

        if (oldVersion == 3) {
            //Create a schema for Bank
            final RealmObjectSchema bankSchema = realmSchema.get("Bank");
            //Create a schema for Token that has been in Bank model
            final RealmObjectSchema tokenSchema = realmSchema.get("Token");
            //We use bankSchema for add tokenList field and transform
            bankSchema
                .addRealmListField("tokenList", tokenSchema)
                .transform((obj) -> {//obj is bank model,we have a transform in bank model
                         DynamicRealmObject token = obj.get("Token");
                         List<DynamicRealmObject> tokenList = obj.get("tokenList");
                                //We add token from pre version to tokenList in new version
                                if (token != null) tokenList.add(token);
                            }
                    )
                    //Finally remove unwanted field
                    .removeField("Token");
        }
}
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