public async Task <int> StartConversationWithOthersAsync(List <int> withUserIds, int userId, int workspaceId)
{
if (withUserIds == null || withUserIds.Count < 1)
{
throw new ArgumentException("Invalid users");
}
if (withUserIds.Count == 1 && withUserIds.Single() == userId)
{
return(await StartSelfConversationAsync(userId, workspaceId));
}
var userIds = withUserIds;
userIds.Add(userId);
var conversationId = await StartConversationForUsersAsync(userIds, userId, workspaceId);
await _cacheService.AddRecentConversationForUserAsync(conversationId, userId, workspaceId);
return(conversationId);
}