public async Task SetModerator(int chatId)
{
var chat = await chatRepository.AddModeratorToChat(Context.User.Identity.Name, chatId);
var users = userRepository.Users.ToArray();
var clients = users
.Where(user => permissionRepository.CheckPermission(user, "ChatModerating") || user.UserName == chat.UserName)
.Select(user => user.UserName)
.ToList();
await Groups.AddToGroupAsync(chat.ModeratorName, GetChatName(chat.ChatId));
await Clients.Users(clients).SendAsync("ModeratorSet", chat);
}