public Chat GetOrCreateChatWithUser(User sender, User receiver, Include <Chat> include = null)
{
var chat = ChatProvider.All(include)
.Include(c => c.UserChats)
.ThenInclude(uc => uc.User)
.FirstOrDefault(c => c.UserChats.Select(uc => uc.User.UserId).Contains(receiver.UserId));
if (chat == null)
{
chat = new Chat {
Type = ChatType.Personal
};
ChatProvider.Add(chat);
AddUserToChat(sender, chat);
AddUserToChat(receiver, chat);
}
return(chat);
}
