Deleted objects are still visible on other threads

[dakexuan]

How frequently does the bug occur?

Always

Description

I successfully delete a piece of data in the worker thread, and then it can be queried in the UI thread or another worker thread. For each operation I get an instance "Realm.getInstance(mRealmConfiguration);",and close immediately after use.Am I using it the wrong way?Interestingly, if I delete the data and do not query it, but close the App, open the App again and query it, I will not find the deleted data

Stacktrace & log output

No response

Can you reproduce the bug?

Always

Reproduction Steps

No response

Version

10.8.0

What Atlas App Services are you using?

-- select --

Are you using encryption?

-- select --

Platform OS and version(s)

android

Build environment

Android Studio version: ... Android Build Tools version: ... Gradle version: ...

[cmelchior]

Realm is a MVCC database, so it can handle multiple versions of data at the same time.

Depending on exactly how you delete the data and how you check it on another thread, it is possible that the other thread is still seeing the older data. You can always force an update by calling realm.refresh(), but that is not really recommended.

If you could show the actual code showing this behaviour, we could probably tell you why it isn't working as expected.

[edualonso]

I can't see anything fundamentally wrong in the code you wrote so it seems like there may be a race condition elsewhere. If you could issue a sample project containing a minimal reproduction case we could help you further.

[dakexuan]

Thank you very much. I found the wrong reason.The deleted data exists in another relationship

[dakexuan]

@edualonso How can I accurately delete a piece of data?This data exists in multiple relationships

public class User extends RealmObject {
    @PrimaryKey
    long id;
    String name
    Dog dog;

    //getters setters etc.
}

public class Dog extends RealmObject {
    @PrimaryKey
    int id;
    String name;

    //getters setters etc.
}
Realm realm = RealmHelper.instance().realm();
Dog dog= realm.where(Dog.class).equalTo("id", id).findFirst();
        if (dog!= null) {
            realm.beginTransaction();
            dog.deleteFromRealm();
            realm.commitTransaction();
        }
realm.close();

If dog exists in User，I can also find it。thx