Realm on Android - How to select multiple objects by list of ids (@PrimaryKey)?

Question

I\'m building an Android app with the Realm database.

I have a RealmObject subclass called Article which has an id field (it\'s an

Answer 1

Update:

Realm 1.2.0 has added RealmQuery.in() for a comparison against multiple values. The documentation details all the available overloads. This one is the method we can use if our ids are Integers:

public RealmQuery in(String fieldName, Integer[] values)

Original answer:

The answer from @ChristianMelchior returns all articles if the list of ids is empty. I want it to return an empty RealmResults

. That's what I've ended up doing;

Set articleIds = this.getArticleIds();
RealmQuery
 query = realm.where(Article.class);
if (articleIds.size() == 0) {
    // We want to return an empty list if the list of ids is empty. 
    // Just use alwaysFalse
    query = query.alwaysFalse();
} else {
    int i = 0;
    for (int id : articleIds) {
        // The or() operator requires left hand and right hand elements. 
        // If articleIds had only one element then it would crash with
        // "Missing right-hand side of OR"
        if (i++ > 0) {
            query = query.or();
        }
        query = query.equalTo("id", id);
    }
}
return query.findAll();