Ruler for Laravel

This library allows you to use your Rule as a string, just like you use existing validators like required, required_if or unique.

For example: Laravel has bundled a rule for enums. As the parameter you pass is a string, you should be able to use it like this:

 [
   'attribute'=>'required|enum:App\Enums\YourEnum'
 ]

right?

wrong!

In order to use it like this, you need to extend your Validator and use the Illuminate\Validation\Rules\Enum rule, or create your own version. This library simplifies that process.

I've gone ahead and registered enum for you, but you can just as easily add your own rules.

Installation

You can install the package via composer:

composer require henzeb/ruler-laravel

note: I only support PHP ^8.1 because of the enums.

Usage

Simply add the Henzeb\Ruler\Concerns\Ruler trait to your service provider and add your rules to the $rules property.

use Henzeb\Ruler\Concerns\Ruler;
use Illuminate\Support\ServiceProvider;
use App\Rules\YourRule;
use App\Rules\YourOtherRule;

class YourProvider extends ServiceProvider
{
    use Ruler;
    
    private array $rules = [
        'your_rule' => YourRule::class,
        YourOtherRule::class
    ]; 
}

You can either specify a name, or just let Ruler create a name for you.

For example: YourOtherRule will get the name your_other_rule.

If your provider needs to implement the boot method, just call the bootRuler method inside that boot method

use Henzeb\Ruler\Concerns\Ruler;
use Illuminate\Support\ServiceProvider;
use App\Rules\YourRule;
use App\Rules\YourOtherRule;

class YourProvider extends ServiceProvider
{
    use Ruler;
    
    private array $rules = [
        'your_rule' => YourRule::class,
        YourOtherRule::class
    ]; 
    
    public function boot() {
        $this->bootRuler();
        // your code
    }
}

It is also possible to do it yourself in case you need to do it conditionally.

use Henzeb\Ruler\Concerns\Ruler;
use Illuminate\Support\ServiceProvider;
use App\Rules\YourRule;
use App\Rules\YourOtherRule;

class YourProvider extends ServiceProvider
{
    use Ruler;
    
    public function boot() {
        if(/** some condition */) {
            $this->rule(YourRule::class, 'your_rule');
        }
        
        if(/** some condition */) {
            $this->rule(YourOtherRule::class);
        }
        // your code
    }
}

The Rule class

The rules are implemented just like any other Rule you'd normally define. So you'll be familiar with the implementation.

use Illuminate\Contracts\Validation\Rule;

class YourRule implements Rule {

    public function passes($attribute, $value)
    {
        // your validation code
    }
    
    public function message() 
    {
        return 'Message when fails';
    }
}

Note: You can also use invokable rules here.

Parameters

You can use parameters. Just add a constructor with the parameters in the order you'd like to use them. Optional parameters are supported.

Note: As for now, you'll receive them as strings, no casting to other scalars is done at this time.

public function __construct(private string $param1, private string $param2 = null){}

Implicit rules

To add an implicit rule, all you have to do is implement the Illuminate\Contracts\Validation\ImplicitRule interface. Ruler will do the rest for you.

use Illuminate\Contracts\Validation\ImplicitRule;

class YourImplicitRule implements ImplicitRule {
    // the code
}

Dependent rules

To add a dependent rule, just implement the Illuminate\Contracts\Validation\DataAwareRule interface. interface Ruler will do the rest for you.

use Illuminate\Contracts\Validation\DataAwareRule;

class DependentRule implements DataAwareRule {
    private array $data;
    
    public function setData(array $data) {
        $this->data = $data;
        return $this;
    }
    
    // your code 
}

Validator aware rules

Ruler also supports Validator aware rules. Just implement the required interface.

mixing up interfaces

You can mix up the interfaces just like you would in vanilla Laravel. For instance: A rule that is implicit can also be dependent

The error message

The error message should be placed in the message method as defined in Illuminate\Contracts\Validation\Rule, just as you normally would.

The message method is called dynamically, which means you can store the message in your Rule instance and return it in the message method.

use Henzeb\Ruler\Contracts\ReplacerAwareRule;
use Illuminate\Contracts\Validation\Rule;

class YourRule implements Rule
{
    return string $message = 'Something went wrong';
    
    public __construct($param_1, $paramTwo) {}
    
    public function passes($attribute, $value)
    {
        $this->message = 'Your error message';
        return false;
    }
    
    public function message()
    {
        return return $this->message;
    }
}

It also supports returning arrays. When an array is returned, the MessageBag contains the messages as if they were coming from different validation rules. This way your Rule can do grouped validations (for instance using another Validator instance).

replacers

Out of the box, you can use :<number> to point to a parameter, but if you want them named, you can use the Henzeb\Ruler\Contracts\ReplacerAwareRule interface.

use Henzeb\Ruler\Contracts\ReplacerAwareRule;

class YourRule implements ReplacerAwareRule
{
    public __construct($param_1, $paramTwo) {}
    
    public function message()
    {
        return ':attribute :param_1 :paramTwo';
    }

    public function replacers(): array
    {
        return [
            'param_1',
            'paramTwo'
        ];
    }
}

The parameters are in order as specified. param_1 will point to the value of $param_1 and so on.

Closures

You can add a Closure to a replacer if you have specific needs. A Closure always receives the value of the current parameter, the attributes name, the other parameters (named) and all the fields that are under validation.

class YourRule implements ReplacerAwareRule
{
    public function message()
    {
        return ':attribute :param_1 :paramTwo';
    }

    public function replacers(): array
    {
        return [
            'param_1'=> function(string $value, string $attribute, array $parameters, array $data) {
                return 'any string'.$parameters['paramTwo']
            },
            'paramTwo'
        ];
    }
}

Overriding the Validator resolver

Because Ruler has a custom Validator instance set to resolve by Laravel, you need to extend the Henzeb\Ruler\Validator\RulerValidator class in case you want to change the resolver.

Testing

composer test

Changelog

Please see CHANGELOG for more information what has changed recently.

Contributing

Please see CONTRIBUTING for details.

Security

If you discover any security related issues, please email henzeberkheij@gmail.com instead of using the issue tracker.

Credits

• Henze Berkheij

License

The GNU AGPLv. Please see License File for more information.