I am trying to construct the following Flow, but with no luck. I am trying to do something like below, but it obviously doesn't compile (it's pseudo code). As you can see, I am trying to map a

chatConversationsFlow: Flow<List<ChatConversation>>

to a

lastMessagesFlow: Flow<List<String>>

. When the last message of a conversation is sent by me, the result will be of the format

"You: ${chatConversation.lastMessage}"

. But when the last message of a conversation is sent by someone else than me, I first need to get

userFlow: Flow<User>

of the specific user, then the result will be of the format

"${user.name}: ${chatConversation.lastMessage}"

. What would be the best (preferably most idiomatic) approach to achieve this in Flow/Coroutines?

private fun lastMessagesFlow(
    chatConversationsFlow: Flow<List<ChatConversation>>
): Flow<List<String>> = flow {
    emit(listOf("Loading"))

    emitAll(
        chatConversationsFlow.map { chatConversations ->
            chatConversations.map { chatConversation ->
                if (chatConversation.lastMessageSentByUserId == -1) "You: ${chatConversation.lastMessage}"
                else {
                    val userFlow: Flow<User> = userFlow(userId = chatConversation.lastMessageSentByUserId)
                    userFlow.map { user ->
                        "${user.name}: ${chatConversation.lastMessage}"
                    }
                }

            }
        }
    )
}