realm-java: Primary key not defined for field 'id' in existing Realm file. Add @PrimaryKey.

Hello! I upgraded from 0.88.2 to 0.90.1 and refactored my RealmObject classes and renamed them. Everything works fine if I clear the app data and it’s a new, clean Realm, but migrating from the old version doesn’t work.

Stacktrace:

io.realm.exceptions.RealmMigrationNeededException: Primary key not defined for field ‘id’ in existing Realm file. Add @PrimaryKey. at io.realm.ChannelRealmProxy.validateTable(ChannelRealmProxy.java:154) at io.realm.DefaultRealmModuleMediator.validateTable(DefaultRealmModuleMediator.java:71) at io.realm.Realm.initializeRealm(Realm.java:316) at io.realm.Realm.createAndValidate(Realm.java:284) at io.realm.Realm.createInstance(Realm.java:263) at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:118) at io.realm.Realm.getDefaultInstance(Realm.java:195) …

Channel.java:

public class Channel extends RealmObject {
    @PrimaryKey
    private long id;
    private String name;
    //...

DbMigration.java:

//Don't want to create a Channel schema, if the previously named one exists
if(schema.get("TvObject") == null && schema.get("Channel") == null) {
    schema.create("Channel")
        .addField("id", long.class, FieldAttribute.PRIMARY_KEY)
        //redacted, just a bunch of String, int and boolean fields
}
//...
if(oldVersion == 7) { 
    schema.rename("TvObject", "Channel");
    schema.get("Channel")
        //redacted the changes, it's a bunch of field renaming and removing
    oldVersion++;
}

It also happens with two other classes that I renamed, and it’s not always the same one that causes the crash. It changes when I redo the upgrade from the old app version to the new one.

I’ve tried using Long with @Required instead of long, adding the primary key in the migration (which causes an exception), nothing helps. Am I doing something wrong?

P.S. Is there a better way to structure migrations with regards to creating the objects? If I rename the objects again, I’ll have three == null checks in the if()s.