update null field to map Firestore

Question

I have such Object:

data class Task(var id: Int? = null,
 var cabinId: Int = 0,
 var startTime: DateTime,
 var endTime: DateTime? = null
)

when I write document it is totaly okey:

    db.collection("games").document(game.idForTitle)
        .set(game)
        .addOnSuccessListener { documentReference ->
            Log.d(TAG, "DocumentSnapshot written with ID: ${documentReference}")
        }
        .addOnFailureListener { e ->
            Log.w(TAG, "Error adding document", e)
        }

but when I try to update the endTime field it throws:

java.lang.IllegalArgumentException: Invalid data. Unsupported type: org.joda.time.DateTime (found in field endTime)

The intersting thing is that startTime filed is writen as map, but endTime is null type.

Anyone knows what to do?

Answer 1

The interesting thing is that startTime field is written as map, but endTime is null type.

The endTime is null because it's initialized in the constructor to be null .

var endTime: DateTime? = null

If you need the sever timestamp, change the type of the field to be of type Date , use an annotation and leave the field uninitialized as explained in my answer from the following post:

• ServerTimestamp is always null on Firebase Firestore

If you need to update a field, make sure that the type of that field is one of the supported data types in Firestore .