kotlin-extensions / io.realm.kotlin / io.realm.RealmResults / toChangesetFlow


fun <T : RealmModel> RealmResults<T>.toChangesetFlow(): Flow<CollectionChange<RealmResults<T>>>

Returns a Flow that monitors changes to this RealmResults. It will emit the current RealmResults upon subscription. For each update to the RealmResults a CollectionChange consisting of a pair with the RealmResults and its corresponding OrderedCollectionChangeSet will be sent. The changeset will be null the first time the RealmResults is emitted.

The RealmResults will continually be emitted as they are updated. This flow will never complete.

Items emitted are frozen (see RealmResults.freeze). This means that they are immutable and can be read on any thread.

Realm flows always emit items from the thread holding the live Realm. This means that if you need to do further processing, it is recommended to collect the values on a computation dispatcher:

  .map { change -> doExpensiveWork(change) }
  .onEach { change ->
    // ...

If you would like toChangesetFlow() to stop emitting items you can instruct the flow to only emit the first item by calling kotlinx.coroutines.flow.first:

val foo = results.toChangesetFlow()


UnsupportedOperationException - if the required coroutines framework is not on the classpath or the corresponding Realm instance doesn't support flows.

IllegalStateException - if the Realm wasn't opened on a Looper thread.

Kotlin Flow that will never complete.