getByCode static method
Resolve by ISO 3166-1 alpha-2 (e.g. BD, US). Falls back to United States.
Implementation
static CountryModel getByCode(String code) {
final c = _service.findByCode(code.toUpperCase());
if (c != null) return fromCountry(c);
final fallback = _service.findByCode('US');
return fromCountry(fallback!);
}