thepsion5/entities

A simple library for managing entities and value objects

Entities

A simple package to aid in managing entities and value objects., _(*1)

, _(*2)

Installation

Add thepsion5/entities as a requirement to your composer.json:, _(*3)

{
    "require": {
        "thepsion5/entity" : "dev-master"
    }
}

Then run composer update., _(*4)

Entities

Add the EntityTrait to the relevant class:, _(*5)

class User implements \Thepsion5\Entities\EntityInterface
{
    use \Thepsion5\Entities\EntityTrait;

    /* snip */
}

Now, your User class will have functions to get and set the ID. If there isn't an ID already defined for this entity via setId(), a new uuid will automatically be generated automatically using PHP's uniqid function., _(*6)

Entity Collections

The GenericEntityCollection class provides a simple API for creating and maintaining collections of entities. Entities are automatically indexed by their IDs. Furthermore, the abstract class AbstractEntityCollection class is provided so that typehinted custom entity classes can be created:, _(*7)

class UserCollection extends AbstractEntityCollection
{

    public function __construct(array $users)
    {
        foreach($users as $user) {
            $this->add($user);
        }
    }

    public function add(UserEntity $user)
    {
        return $this->addEntity($user);
    }

    public function get($id)
    {
        return $this->getEntity($id);
    }

    public function has($entityOrId)
    {
        return $this->hasEntity($id);
    }
}

Value Objects

Creating a generic Value Object is as simple as creating a class and using the correct trait:, _(*8)

class Title
{
    use \Thepsion5\Entities\Traits\SimpleValueObjectTrait;
}

Using them is equally simple:, _(*9)

$title = new Title('This is a title');
$invalidTitle = new Title(''); //will throw an invalid argument exception
print $title; //converts the value back to a string

You can also define more complex rules for whether a VO is valid:, _(*10)

class Email
{
    use \Thepsion5\Entities\Traits\SimpleValueObjectTrait;

    protected function isValid($email)
    {
        return filter_var($email, FILTER_VALIDATE_EMAIL);
    }

    protected function onInvalid($value)
    {
        throw new \InvalidArgumentException("The email [$value] is not a valid email address.");
    }
}

Enums

An Enum trait is provided to make the implementation and use of enums simpler. All that's needed is to define class constants representing the enum values and then use the trait:, _(*11)

class UserStatus
{
    use \Thepsion5\Entity\Traits\EnumTrait;

    const BANNED        = -1;
    const UNACTIVATED   = 1;
    const ACTIVATE      = 2;
}

UseStatus::toArray(); //['BANNED' => -1, 'UNACTIVATED' => 1, 'ACTIVATED' => 2]
$banned = UserStatus::BANNED();
$banned == new UserStatus(UserStatus::BANNED); //true
$banned->is('BANNED'); //true

Todo

• Pre-defined value objects for common use-cases