Laravel specification pattern

Filter an Illuminate collection with specifications.

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Installation

You can install the package via composer:

composer require maartenpaauw/laravel-specification-pattern

You can publish the config file with:

php artisan vendor:publish --tag="laravel-specification-pattern-config"

This is the contents of the published config file:

return [
    'collection-method' => 'matching',
];

Usage

Here's how you can create a specification:

php artisan make:specification AdultSpecification

This will generate a specification class within the App\Specifications namespace.

<?php

namespace App\Specifications;

use Maartenpaauw\Specifications\Specification;

/**
 * @implements  Specification<mixed>
 */
class AdultSpecification implements Specification
{
    /**
     * {@inheritDoc}
     */
    public function isSatisfiedBy(mixed $candidate): bool
    {
        return true;
    }
}

Imagine we have the following class which represents a person with a given age.

class Person {
    public function __construct(public int $age)
    {}
}

Let's apply the business logic:

<?php

namespace App\Specifications;

use Maartenpaauw\Specifications\Specification;

/**
- * @implements  Specification<mixed>
+ * @implements  Specification<Person>
 */
class AdultSpecification implements Specification
{
    /**
     * {@inheritDoc}
     */
    public function isSatisfiedBy(mixed $candidate): bool
    {
-        return true;
+        return $candidate->age >= 18;
    }
}

After applying the bussiness logic we can use the specification by directly calling the isSatisfiedBy method or indirectly be filtering an eloquent collection by calling the matching method.

Direct

$specification = new AdultSpecification();

// ...

$specification->isSatisfiedBy(new Person(16)); // false
$specification->isSatisfiedBy(new Person(32)); // true

Indirect

$persons = collect([
    new Person(10),
    new Person(17),
    new Person(18),
    new Person(32),
]);

// ...

// Returns a collection with persons matching the specification
$persons = $persons->matching(new AdultSpecification());

// ...

$persons->count(); // 2

Testing

composer test

Changelog

Please see CHANGELOG for more information on what has changed recently.

Contributing

Please see CONTRIBUTING for details.

Security Vulnerabilities

Please review our security policy on how to report security vulnerabilities.

Credits

• Maarten Paauw
• All Contributors

License

The MIT License (MIT). Please see License File for more information.