Realm Error: This method is only available in managed mode

Question

When I install my app for first time on my phone, the app crashes because of the Realm error: This method is only available in managed mode which I really don't understand much of

This happends when I try to get a sorted list of ListItem in the class Shoplist

public class Shoplist extends RealmObject implements Serializable {

private RealmList<ListItem> itemList;   //ListItem extends `RealmObject`

@Ignore
private Realm realm;

@PrimaryKey
private long id;

public Shoplist() {

    realm = Realm.getDefaultInstance();
}

public RealmList<ListItem> getItemList() {
    return itemList;
}

 public List<ListItem> getItems(String listOrder) {

    RealmResults<ListItem> realmResults;

    switch (listOrder) {
        case PrefActivity.ASCENDING:
            realmResults = getItemList().where().findAll(); // this crashes!
            break;

        case PrefActivity.DESCENDING:
            realmResults = getItemList().where().findAllSorted(ListItem.TIME_STAMP, Sort.DESCENDING);
            break;
    }

    return realmResults;
   }
}

A Shoplist object is created like this in a class called RealmService

public Shoplist createShoplist(String title) {

    realm = Realm.getDefaultInstance();
    realm.beginTransaction();
    Shoplist shoplist = new Shoplist(new RealmList<ListItem>(), title);
    realm.copyToRealm(shoplist);
    realm.commitTransaction();

    return shoplist;

}

STATS:

Realm Gradle Plugin: 2.3.1

Gradle Plugin: 2.2.3

Compile version: 25

Android Studio version: 2.2.3

Test phone: Samsung Galaxy S7

Answer 1

You need work with managed object. Your error happen when Shoplist object created with new operator - it's not managed object.

You need to wrap instance of Shoplist to Realm:

public Shoplist createShoplist(String title) {

     realm = Realm.getDefaultInstance();
     realm.beginTransaction();

     Shoplist shoplist = realm.createObject(Shoplist.class)
     shoplist.setTitle(title);

     realm.copyToRealm(shoplist);
     realm.commitTransaction();

     return shoplist;
}