CODEWITHSUNDEEP
javaandroidrealmrealm-migration
Luca Nicoletti
Luca Nicoletti

Reputation: 2417

RealmMigration erased every data in my realm

Today I changed my application realm schema, and so I implemented a Migration. Inside the migration, I just needed to add a field, so I did:

 if (oldVersion == 0) {
    RealmObjectSchema class = schema.get("Class");
    class.addField("addedField", boolean.class, null)
       .transform(new RealmObjectSchema.Function() {
           @Override
           public void apply(DynamicRealmObject obj) {
              obj.set("addedField", false);
           }
       });
       oldVersion++;
}

But this erased everything in my realm, I got no more data.

This is not a problem as I'm still in dev phase. I did the migration instead of uninstalling/reinstalling the app just to learn how to implement a RealmMigration.

Did I do something wrong? Is it normal that I got everything erased? Did I need to add some more code? I already read the documentation and had a look at the sample app. The code provided didn't got anything more.

Realm configuration:

Realm.init(this);
RealmConfiguration newConfig = new RealmConfiguration.Builder()
   .name("myRealm.realm")
   .schemaVersion(1)
   .migration(new SchemaMigration())
   .build();

And at least:

Realm realm = Realm.getInstance(newConfig);

EDIT:

I solved this by removing the name("myRealm.realm"). At the first installation I didn't use a RealmConfiguration so the name of the realm was: "default.realm". Thank you guys for your support and your answers!

Upvotes: 1

Views: 77

Answers (1)

Sergei Bubenshchikov
Sergei Bubenshchikov

Reputation: 5361

Try do not pass null as a field attributes and use type specific setter (setBoolean) for transformation of DynamicRealmObject:

if (oldVersion == 0) {
    RealmObjectSchema class = schema.get("Class");
    class.addField("addedField", boolean.class)
         .transform(new RealmObjectSchema.Function() {
             @Override
             public void apply(DynamicRealmObject obj) {
             obj.setBoolean("addedField", false);
         }
    });
    oldVersion++;
}

Upvotes: 1

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