public IActionResult SearchUserForInvitation([FromBody] SearchUserForInvitationRequest request)
{
var result = _userFacade.FindUsersForInvite(request.Username, request.GroupId, request.WantToTeach);
var items = new List <MinUserForInvitationItem>();
result.ToList().ForEach(res => items.Add(
new MinUserForInvitationItem(res.Invited, res.Username, res.IsTeacher, res.Id, res.AvatarLink)
));
var response = new MinUserForInvitationResponse(items);
return(Ok(response));
}