CassandraReadJournal cannot get events by persistence id

Lagom Version (1.2.x / 1.3.x / etc)

1.3.9

API (Scala / Java / Neither / Both)

Scala

Expected Behavior

1. Persist event A with PersistentEntity whose persistenceId is X
2. Create a cassandra read journal readJournal:

private val readJournal = 
  PersistenceQuery(actorSystem).readJournalFor[CassandraReadJournal](CassandraReadJournal.Identifier)

1. get all current events in that read journal by persistenceId X

val events = readJournal
      .currentEventsByPersistenceId(X, 0, Long.MaxValue)
      .runWith(Sink.seq[Any])

1. yield a sequence containing A

Actual Behavior

events is always empty

Reason

<del> When `currentEventsByPersistenceId` issues a query, the underlying query is:

SELECT tag1, timebucket, timestamp, persistence_id, partition_nr, sequence_nr, writer_uuid, ser_id, ser_manifest, event_manifest, event, message
         FROM whatever_keyspace.messages
         WHERE persistence_id IS NOT NULL AND partition_nr IS NOT NULL AND sequence_nr IS NOT NULL
           AND tag1 IS NOT NULL AND timestamp IS NOT NULL AND timebucket IS NOT NULL
         PRIMARY KEY ((tag1, timebucket), time... [truncated output]

However, Lagom’s persistence does not persist tag1, tag2, tag3, or message. Therefore, the resultant select yields an empty list.

</del> `persistenceId` is not the same thing as the persistent entity's Id.

[erip]

@ignasi35 For complete closure, I’ll post a notional solution:

Because entityTypeName is a class member (not static), I added entityTypeName to a companion object to my PersistentEntity, with which I override the PersistentEntity’s entityTypeName. Then I can access a static persistenceId and futureproof my DB (like the docs mention).

[erip]

And to confirm, the above solution worked. 👍