public async Task <IEnumerable <GroupDTO> > Get([FromQuery] string filter)
{
if (!string.IsNullOrEmpty(filter))
{
return(_mapper.Map <IEnumerable <Group>, IEnumerable <GroupDTO> >(_service.FindFilterByNameOrId(filter)));
}
else
{
return(_mapper.Map <IEnumerable <Group>, IEnumerable <GroupDTO> >(await _service.FindAll()));
}
}