CODEWITHSUNDEEP
javarealm
JayVDiyk
JayVDiyk

Reputation: 4487

Delete All Realm Objects During Runtime

on iOS we can easily call realm.deleteAllObjects(); to remove all objects in our Realm database.

How do we achieve the same in Android?

Upvotes: 13

Views: 19265

Answers (7)

Morten J
Morten J

Reputation: 914

Looks like the Realm API has changed. According to the docs, this is now the way 

let all = realm.objects(Books.self)
realm.delete(all)

Don't forget to wrap it in a transaction if you haven't already.

    try! realm.write {
            let all = realm.objects(Rogets.self)
            realm.delete(all)
        }

Upvotes: -1

Fidan Bacaj
Fidan Bacaj

Reputation: 416

           try {
       val realm = Realm.getDefaultInstance()
        realm.beginTransaction()
        realm.delete<Dog>()
        realm.insertOrUpdate(dogs)
        realm.commitTransaction()
        realm.close()
    } catch (e: Exception) {
        e.message
    }

Upvotes: 0

Shripada
Shripada

Reputation: 6522

You can do this by using results- For instance, if I want to delete all Dog objects, I can do the following-

// obtain the results of a query

RealmResults<Dog> results = realm.where(Dog.class).findAll();

// All changes to data must happen in a transaction
realm.beginTransaction();

// Delete all matches
results.deleteAll();

realm.commitTransaction();

Ref: documentation

Upvotes: 22

Aks4125
Aks4125

Reputation: 5720

UPDATE 3.7.0

realm.beginTransaction();
realm.deleteAll();
//else realm.delete(obj_A.class);
realm.commitTransaction();

Upvotes: -1

iamtodor
iamtodor

Reputation: 854

For now clear() is deprecated. Instead, referring to documentation you should use results.deleteAllFromRealm() or realm.deleteAll() or realm.delete(Dog.class).

Upvotes: 8

David Miguel
David Miguel

Reputation: 14470

Delete all objects from Realm database:

realm.executeTransaction(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
        realm.deleteAll();
    }
});

Delete all objects of a kind from Realm database:

realm.executeTransaction(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
        realm.delete(Dog.class);
    }
});

Delete the results of a query:

final RealmResults<Dog> results = realm.where(Dog.class).findAll();

realm.executeTransaction(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
        // remove single match
        results.deleteFirstFromRealm();
        results.deleteLastFromRealm();

        // remove a single object
        Dog dog = results.get(5);
        dog.deleteFromRealm();

        // Delete all matches
        results.deleteAllFromRealm();
    }
});

Upvotes: 23

Awesome Code
Awesome Code

Reputation: 141

I'm use this for delete all objects:

    private void clearAllRealmPerson(){

        Realm realm = Realm.getDefaultInstance();

        realm.beginTransaction();
        realm.clear(Person.class);
        realm.commitTransaction();
        realm.close();
   }

Upvotes: 3

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