public async Task LeaveChannel(Guid channelId)
{
var currentUserId = _authService.GetAuthorizedUserId();
var channelUser = await DbContext.ChatChannelUsers
.Include(cu => cu.User)
.FirstOrDefaultAsync(cu => cu.ChannelId == channelId && cu.UserId == currentUserId);
if (channelUser == null)
{
throw new EntityNotFoundException("User doesn't belong to this group");
}
DbContext.ChatChannelUsers.Remove(channelUser);
await DbContext.SaveChangesAsync();
await _chatProvider.UserLeftFromChannel(channelUser.User, channelId);
}
