Laravel State Machine

• Author: Valerio Barbera - support@logengine.dev
• Author Website: www.logengine.dev

State machine for Laravel based applications.

Install

composer require ilvalerione/state-machine

Config

php artisan vendor:publish --provider="Aventure\StateMachine\ServiceProvider"

This command publish a new configuration file in your config directory to list all state graphs that you want use in your application.

The default config file ships with a complete graph example.

Eloquent model integration

Add HasStateMachine trait to the eloquent model which you want manage its state:

class Order extends Model
{
    use HasStateMachine;
    
    ...

Assign state machine configuration to the model

class Order extends Model
{
    use HasStateMachine;

    /**
     * StateMachine configuration
     *
     * @return array
     */
    protected function stateMachineConfig() : array
    {
	    // This is the name of the graph in the "state-machine.php" config file
        return [
            'graph' => 'order',
        ];
    }
}

Default status

Use the eloquent $attributes property to set the default status of your object:

class Order extends Model
{
    use HasStateMachine;
	
    /**
     * Default model's attributes.
     *
     * @var array
     */
    protected $attributes = [
        'status' => 'pending'
    ];

    /**
     * StateMachine configuration
     *
     * @return array
     */
    protected function stateMachineConfig() : array
    {
	    // This is the name of the graph in the "state-machine.php" config file
        return [
            'graph' => 'order',
        ];
    }
}

Events

StateMachine provide you two main hooks to control the transition between states:

• Transitioning
• Transited

to point before and after every status change.

In the example below in your EventServiceProvider you can point before and after Order's "accept" transition.

class EventServiceProvider extends ServiceProvider
{
    /**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
		'state_machine.transitioning.order.accept' => [
           ListenBeforeOrderIsAccepted::class,
        ],

        'state_machine.transited.order.accept' => [
            ListenAfterOrderIsAccepted::class,
        ],
    ];
}

The name of the events is dynamically composed using the convention below:

// Before trantion execution
state_machine.transitioning.[class_name].[transition_name]

// After trasition is executed
state_machine.transited.[model_class_name].[transition_name]

In this way you can attach your listener to a specific object when a particular transition happen.

LICENSE

This package are licensed under the MIT license.