CODEWITHSUNDEEP
androidrealm
shoe
shoe

Reputation: 1070

Reading a RealmObject from another thread

I have a RealmObject User that I store in a singleton and access throughout the application -- it was retrieved on the UI thread. The object represents the logged in user, and has a one-to-many relationship with the Item class. When changing it in a transaction such as in:

RealmSingleton.getUserInstance().executeTransactionAsync(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
        User user = realm.where(User.class).equalTo("mId",UserSingleton.getUser().getId()).findFirst();
        user.deleteItem(mItem.getClassId());
    }
});

This won't work because I'm accessing it inside of the transaction that occurs in another thread. Just to clarify, what I need to do here is store the user's id outside of the transaction and then access that stored variable within the transaction when making the query, like so?

Integer userId = UserSingleton.getUser().getId();
Integer classId = mItem.getClassId();
RealmSingleton.getUserInstance().executeTransactionAsync(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            User user = realm.where(User.class).equalTo("mId",userId).findFirst();
            user.deleteItem(classId);
        }
    });

Upvotes: 1

Views: 439

Answers (1)

Christian Melchior
Christian Melchior

Reputation: 20126

Yes, that is correct. You cannot access an object on multiple threads, so in your case storing a reference to the ID and use that to requery the object is the right approach.

Upvotes: 2

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