IsIn function
Implementation
ValidationRule IsIn(List<dynamic> array, {String? message}) => ValidationRule(
message: message,
constraints: [array],
validate: (value, arguments) =>
Future(() => arguments.constraints[0].contains(value)),
defaultMessage: (arguments) {
String property = arguments.property;
String arrayValues = arguments.constraints[0].join(', ');
return '"$property" must be one of the following values: $arrayValues';
});