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Generic ​

The Generic Validation is a new feature provided in Validasi starting from version 0.0.4. This new validation allow you to validate any type of data for instance checking, transforming, and etc. The GenericValidator expect T as the type to validate against.

Available rules for GenericValidator:

equalTo ​

dart
Validasi.generic<T>(transformer).equalTo(T value, {String? message});

The equalTo method is used to validate that the value is equal to the specified value. This method will return an error if the value is not equal to the specified value.

dart
import 'package:validasi/validasi.dart';

void main() {
    final schema = Validasi.generic<String>().equalTo('a');

    final result = schema.tryParse('b');

    print(result.errors.first.message); // 'field must be equal to a'
}

INFO

The equality check uses == operator to compare the value. Therefore, it is recommended for you to override the == operator in your custom class to ensure the equality check works as expected.

notEqualTo ​

dart
Validasi.generic<T>(transformer).notEqualTo(T value, {String? message});

The notEqualTo method is used to validate that the value is not equal to the specified value. This method will return an error message if the value is equal to the specified value.

dart
import 'package:validasi/validasi.dart';

void main() {
    final schema = Validasi.generic<String>().notEqualTo('a');

    final result = schema.tryParse('a');

    print(result.errors.first.message); // 'field must not be equal to a'
}

INFO

Similar to equalTo, the equality check uses != operator to compare the value. Therefore, it is recommended for you to override the == operator in your custom class to ensure the equality check works as expected.

oneOf ​

dart
Validasi.generic<T>(transformer).oneOf(List<T> values, {String? message});

The oneOf method is used to validate that the value is one of the specified values. This method will return an error message if the value is not in the specified list.

dart
import 'package:validasi/validasi.dart';

void main() {
    final schema = Validasi.generic<String>().oneOf(['a', 'b']);

    final result = schema.tryParse('c');

    print(result.errors.first.message); // 'field must be one of a, b'
}

INFO

Similar to equalTo but with multiple values. It will return an error message if the value is not in the specified list.

notOneOf ​

dart
Validasi.generic<T>(transformer).notOneOf(List<T> values, {String? message});

The notOneOf method is used to validate that the value is not one of the specified values. This method will return an error message if the value is in the specified list.

dart
import 'package:validasi/validasi.dart';

void main() {
    final schema = Validasi.generic<String>().notOneOf(['a', 'b']);

    final result = schema.tryParse('a');

    print(result.errors.first.message); // 'field must not be one of a, b'
}

INFO

Just like oneOf, but the opposite. It will return an error message if the value is in the specified list.