<how to save an object in object in real-time data...

# stackoverflow

[user]

how to save an object in object in real-time database, Firebase (kotlin)
I would like to save data into the real-time database of Firebase, but I run into a problem. I've only been working with Kotlin for 1 month, and unfortunately I don't know how to save data to the real-time database in this form, as shown in the picture.
My current code is this:
data class userData(
val username: String,
val uid: String,
)

database = FirebaseDatabase.getInstance().getReference("Userdata")
val user = uid?.let {
userData("Test1", it)
}

if (uid != null) {...