[Issue] ServerTimestamp not working

[marcelpallares]

I'm trying to use ServerTimestamp on one of my entity data classes from Firestore. I have tried following what the README says and I added the Timestamp like:

@Serializable
data class Post(
    val timestamp: Timestamp = Timestamp.ServerTimestamp,
)

However, the code complains because ServerTimestamp is not a Timestamp but a BaseTimestamp. Instead, I have tried using:

@Serializable
data class Post(
    val timestamp: BaseTimestamp = Timestamp.ServerTimestamp,
)

The BaseTimestamp approach seems to be working to read existing data, however, when trying to write a new ServerTimestamp I'm getting the following runtime exception:

Caused by: java.lang.RuntimeException: No properties to serialize found on class dev.gitlive.firebase.firestore.Timestamp$ServerTimestamp
    at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.<init>(CustomClassMapper.java:738)
    at com.google.firebase.firestore.util.CustomClassMapper.loadOrCreateBeanMapperForClass(CustomClassMapper.java:383)
    at com.google.firebase.firestore.util.CustomClassMapper.serialize(CustomClassMapper.java:184)
    at com.google.firebase.firestore.util.CustomClassMapper.access$400(CustomClassMapper.java:58)
    at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.serialize(CustomClassMapper.java:926)
    at com.google.firebase.firestore.util.CustomClassMapper.serialize(CustomClassMapper.java:185)
    at com.google.firebase.firestore.util.CustomClassMapper.serialize(CustomClassMapper.java:108)
    at com.google.firebase.firestore.util.CustomClassMapper.convertToPlainJavaTypes(CustomClassMapper.java:82)
    at com.google.firebase.firestore.UserDataReader.convertAndParseDocumentData(UserDataReader.java:232)
     at com.google.firebase.firestore.UserDataReader.parseMergeData(UserDataReader.java:88)
    at com.google.firebase.firestore.DocumentReference.set(DocumentReference.java:166)

Am I doing something wrong here? Is this a known issue?
Thanks!

[mattegoghero]

Having the same problem, can't use the ServerTimestamp as written in the documentation

[nbransby]

@Daeda88 do you know the issue here?

[Daeda88]

Not sure why it's wrong. I see we just use BaseTimestamp, from what it looks like also to write. But perhaps there is a bug.

[Daeda88]

In the test I see we have:
doc.set(FirestoreTimeTest.serializer(), FirestoreTimeTest("ServerTimestampBehavior", Timestamp.ServerTimestamp))

@marcelpallares can you try passing the Post.serializable() to doc.set?

EDIT: Also the crashlogs seem to be serializing at the Google firestore implementation. Are you sure you're calling dev.gitlive.firebase.firestore.DocumentReference.set? In any case it looks like the Timestamp reaches the internal Android SDK as the Gitlive timestamp rather than the google one (which is should have been encoded as). My best guess is that passing the serializer fixes that.