Adding standalone-objects to a RealmList

Question

Is it possible to add standalone objects to a RealmList of an RealmObject already persisted in a realm?

Well, I know it doesnt work, because I get NPEs at (object.row.getIndex():RealmList:94)

What I want to do is:

mRealm.beginTransaction;
contact.getEmails().add(new Email());
mRealm.commitTransaction;

Because at that specific moment I dont have access to a Realm (well I could make it work, but I would have to rewrite some structures), for example:

//In Activity
Contact contact = Realm.where(Contact.class).equalsTo("name","pete").findAll().first();
mRealm.beginTransaction;
UpdateHelper.update(contact);
mRealm.commitTransaction;

//Helper class some else package
public static void update(Contact contact) {
    //do update stuff
    contact.getEmails().add(new Email());
}

`

score 8 · Accepted Answer · edited Oct 12 '16 at 19:31

Christian from Realm here. No, currently that is not possible. It is an interesting use case though. The reason we have a Realm.copyToRealm() method is to make it really explicit that you should no longer use your old object. Allowing to add standalone objects to already persisted lists would make that less transparent. You also still need it to happen inside a write transaction. Adding a reference to the Realm in your method call would probably be the best way to solve it.

//In Activity
realm.executeTransaction(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
        Contact contact = realm.where(Contact.class)
                               .equalTo("name","pete")
                               .findFirst();
        if(contact != null) {
            UpdateHelper.update(contact, realm);
        }
    }
});

//helper method
public static void update(Contact contact, Realm realm) {
    //do update stuff
    Email email = realm.copyToRealm(new Email());
    contact.getEmails().add(email);
}

Your solution also came to my mind. I just wanted to clarify if there is another option than channeling the Realm object all the way through a cascade of calls. But oh well :) Do I really need to begin a transaction twice? Outside of the `UpdateHelper.update()` and again within? — degill, Jan 21 '15 at 16:58

Adding standalone-objects to a RealmList

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