Update statement in Realm android

Question

How should i update a already existing value using realm DB in android?

I have been trying to update it but it is adding as a new value only not overwritting it

Answer 1

Realm realm = Realm.getDefaultInstance();
    OrderedRealmCollection<Practice> orderedRealmCollection = 
             realm.where(Practice.class)
            .contains("key", "matchig value")
            .findAll();

    if(orderedRealmCollection.size()!=0){
        Practice practice = orderedRealmCollection.first();
        Realm.getDefaultInstance().executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                practice.setUpdate_practice_steps(""+steps);
                realm.insertOrUpdate(practice);
            }
        });
    }

Answer 2

You can user insertOrUpdate method to do this.Hope this helps

  Realm.getDefaultInstance().executeTransaction(new Realm.Transaction() {
                @Override
                public void execute(Realm realm) {

                    objectToEdit.setNewValue("string");
                    realm.insertOrUpdate();
                }
            });

Answer 3

Another way to update an existing object with all its fields in your Realm DB is using the method realm.copyToRealmOrUpdate():

Object obj = new Object();
obj.setField1(field1);
obj.setField2(field2);
realm.beginTransaction();
realm.copyToRealmOrUpdate(obj);
realm.commitTransaction();

If your object has a Primary Key, this method will update the object automatically without duplicate objects :)

More info: copyToRealmOrUpdate()