public Bitters Get(int id)
        {
            var entity = _dataContext.Bitters
                         .Include(b => b.CocktailBitters)
                         .SingleOrDefault(b => b.BittersId == id);

            return(entity == null ? null : BittersEntity.Map(entity));
        }
        public Bitters Add(Bitters model)
        {
            var entity     = BittersEntity.Map(model);
            var newBitters = _dataContext.Bitters.Add(entity).Entity;

            _dataContext.SaveChanges();
            return(BittersEntity.Map(newBitters));
        }