private Either <string, int> Validate(GetIngredientById query) =>
GreatThanZero(query.Id)
.ToEither("O id de para pequisa tem que ser maior que 0");
public Task <Either <string, Ingredient> > Handle(GetIngredientById query) =>
Validate(query)
.Match(
id => RetrieveIngredient(id),
e => Task.FromResult(new Either <string, Ingredient>(e))
);
