public async Task <IEnumerable <DrugDTO> > GetDrugs()
{
if (!ModelState.IsValid)
{
return(null);
}
var drug = await drugRepository.GetAllDrugsAsync();
var drugDtoCollection = new List <DrugDTO>();
drug.ToList().ForEach(x => drugDtoCollection.Add(mapper.Map <Drug, DrugDTO>(x)));
return(drugDtoCollection);
}