toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (cities != null) 'cities': cities!,
if (countries != null) 'countries': countries!,
if (excludeCountries != null) 'excludeCountries': excludeCountries!,
if (metros != null) 'metros': metros!,
if (postalCodes != null) 'postalCodes': postalCodes!,
if (regions != null) 'regions': regions!,
};