Iterable Rules

List and iterable validation rules for collections.

IterableRules.minLength()

Validates that an iterable (list, set, etc.) has a minimum number of elements.

Syntax

IterableRules.minLength<T>(int length, {String? message})

Parameters

• T - The type of elements in the iterable
• length (int, required) - The minimum number of elements required
• message (String?, optional) - Custom error message

Default Error Message

"Minimum length is {length} items"

Example

final tagsSchema = Validasi.list<String>([
  IterableRules.minLength(1, message: 'At least one tag is required'),
]);

print(tagsSchema.validate([]).isValid); // false
print(tagsSchema.validate(['dart']).isValid); // true

IterableRules.forEach()

Validates each element in an iterable using a specified schema.

Syntax

IterableRules.forEach<T>(ValidasiEngine<T> validator)

Parameters

• T - The type of elements in the iterable
• validator (ValidasiEngine<T>, required) - The validation schema to apply to each element

Example

final emailsSchema = Validasi.list<String>([
  IterableRules.forEach(
    Validasi.string([
      Transform((value) => value?.trim().toLowerCase()),
      InlineRule<String>((value) {
        return value.contains('@') ? null : 'Invalid email';
      }),
    ])
  ),
]);

final result = emailsSchema.validate(['JOHN@EXAMPLE.COM', 'JANE@EXAMPLE.COM']);
print(result.isValid); // true
print(result.data); // ['john@example.com', 'jane@example.com']

See Also

• List Validation Examples