public async Task <IEnumerable <ChatMessageModel> > GetMessagesByChannelAsync(string userId, int channelId)
{
var channel = await(from c in _chatChannelRepository.GetAll()
join member in _chatChannelMemberRepository.GetAll() on c.ChannelId equals member.ChannelId
where member.UserId == userId && c.ChannelId == channelId
select c).FirstOrDefaultAsync();
if (channel == null)
{
throw new NotFoundException("Channel not found or user doesn't have access.");
}
var messages = await _chatMessageRepository.GetAll()
.Where(_ => _.ChannelId == channelId)
.ToListAsync();
return(_mapper.Map <IEnumerable <ChatMessageModel> >(messages));
}
