Validation

Bag uses Laravel's validation system to validate input data. You can define validation rules using annotations, and/or using the rules() method.

Bag will automatically validate input data when creating a new instance using the Bag::from() method.

use Bag\Attributes\Validation\Required;
use Bag\Bag;

readonly class MyValue extends Bag
{
    public function __construct(
        #[Required]
        public string $name,
        public int $age,
    ) {
    }

    public static function rules(): array
    {
        return [
            'name' => ['string'],
            'age' => ['integer'],
        ];
    }
}

In this example we added a #[Required] attribute to the name property, and defined validation rules in the rules() method.

You can validate a Bag object using the Bag::validate() method:

$value = MyValue::validate([
    'name' => 'Davey Shafik',
    'age' => 40,
]);

Built-in Validation Attributes

Bag provides a number of built-in validation attributes, based on various Laravel validation rules:

Rule		Usage
Between	The value should be between two values (inclusive)	#[Between(1, 10)]
Boolean	The value should be a boolean	#[Boolean]
Decimal	The value should be a decimal number	#[Decimal]
Email	The value should be an email address	#[Email]
Enum	The value should be an enum case	#[Enum(MyEnum::class)]
Exists	The value must exist in a field in a table	#[Exists('table', 'optionalColumn')]
In	The value should be in the given list	#[In('foo', 'bar')]
Integer	The value should be an integer	#[Integer]
Max	The value should be at most a given size	#[Max(100)]
Min	The value should be at minimum a given size	#[Min(1)]
NotRegex	The value should not match a given regex	#[NotRegex('/regex/')]
Numeric	The value should be numeric	#[Numeric]
Regex	The value should match a given regex	#[Regex('/regex/')]
Required	The value is required	#[Required]
RequiredIf	The value is required if another field matches a value	#[RequiredIf('otherField', 'value')]
RequiredUnless	The value is required unless another field matches a value	#[RequiredUnless('otherField', 'value')]
RequiredWith	The value is required if another field is present	#[RequiredWith('otherField')]
RequiredWithAll	The value is required if more than one other field is present	#[RequiredWithAll('field1', 'field2')]
Size	The value should have a specific size	#[Size(10)]
Str	The value should be a string	#[Str]
Unique	The value must be unique for a field in a table	#[Unique('table', 'optionalColumn')]

In addition, a generic \Bag\Attributes\Validation\Rule attribute is available to apply any Laravel validation rule:

use Bag\Attributes\Validation\Rule;

readonly class MyValue extends Bag
{
    public function __construct(
        #[Required]
        public string $username,
        public string $password,
        #[Rule('same:password')]
        public string $passwordConfirmation,
    ) {
    }
}