Deleting RealmObject from RealmList

Question

I have a RealmObject called, say A that is contained in a RealmList in RealmObjects B and C. B and C both have many to many relationships.

How do i remove the A from the RealmList in B but maintain it's relationship with C (i.e it should still be in Cs RealmList)?

In short, I need to know how to remove an object from a RealmList without affecting the other relationships the same object (without deleting it from Realm).

Answer 1

Just like any list, really.

realm.executeTransaction(new Realm.Transaction() {
    B b = realm.where(B.class).equalTo(BFields.ID, bId).findFirst();
    Iterator<A> iterator = b.getRealmList().iterator();
    while(iterator.hasNext()) {
        A a = iterator.next();
        if(a.getId().equals(idToDelete)) {
            iterator.remove(); // removes from realm list, but not from Realm
            break;
        }
    }
});

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But I think if you redefine hashCode() and equals() to work based on primary key, then that ought to work reliably with remove(Object object) as well.