Introducing beforeCreating

AppServiceProvider.php

<?php

namespace App\Providers;

use App\ExtendedFactory;
use Faker\Generator as FakerGenerator;
use Illuminate\Database\Eloquent\Factory as EloquentFactory;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        $this->app->singleton(EloquentFactory::class, function ($app) {
            return ExtendedFactory::construct(
                $app->make(FakerGenerator::class), $this->app->databasePath('factories')
            );
        });
    }
}

ExtendedFactory.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Factory;

class ExtendedFactory extends Factory {

    /**
     * The registered after creating callbacks.
     *
     * @var array
     */
    protected $beforeCreating = [];

    /**
     * Define a callback to run before creating a model.
     *
     * @param  string  $class
     * @param  callable  $callback
     * @param  string  $name
     * @return $this
     */
    public function beforeCreating($class, callable $callback, $name = 'default')
    {
        $this->beforeCreating[$class][$name][] = $callback;

        return $this;
    }

    /**
     * Define a callback to run before creating a model with given state.
     *
     * @param  string  $class
     * @param  string  $state
     * @param  callable  $callback
     * @return $this
     */
    public function beforeCreatingState($class, $state, callable $callback)
    {
        return $this->beforeCreating($class, $callback, $state);
    }

    /**
     * Create a builder for the given model.
     *
     * @param  string  $class
     * @return \Illuminate\Database\Eloquent\FactoryBuilder
     */
    public function of($class)
    {
        return new ExtendedFactoryBuilder(
            $class, $this->definitions, $this->states,
            $this->afterMaking, $this->afterCreating, $this->beforeCreating, $this->faker
        );
    }
}

ExtendedFactoryBuilder.php

<?php

namespace App;

use Faker\Generator as Faker;
use Illuminate\Database\Eloquent\FactoryBuilder;
use Illuminate\Database\Eloquent\Model;

class ExtendedFactoryBuilder extends FactoryBuilder
{
    /**
     * @var array
     */
    private $beforeCreating = [];

    public function __construct($class, array $definitions, array $states,
                                array $afterMaking, array $afterCreating, array $beforeCreating, Faker $faker)
    {
        parent::__construct($class, $definitions, $states, $afterMaking, $afterCreating, $faker);

        $this->beforeCreating = $beforeCreating;
    }

    /**
     * Create a collection of models and persist them to the database.
     *
     * @param  array  $attributes
     * @return \Illuminate\Database\Eloquent\Collection|\Illuminate\Database\Eloquent\Model|mixed
     */
    public function create(array $attributes = [])
    {
        $results = $this->make($attributes);

        if ($results instanceof Model) {
            $this->callBeforeCreating(collect([$results]));

            $this->store(collect([$results]));

            $this->callAfterCreating(collect([$results]));
        } else {
            $this->callBeforeCreating(collect([$results]));

            $this->store($results);

            $this->callAfterCreating($results);
        }

        return $results;
    }

    /**
     * Run before creating callbacks on a collection of models.
     *
     * @param  \Illuminate\Support\Collection  $models
     * @return void
     */
    public function callBeforeCreating($models)
    {
        $this->callBefore($this->beforeCreating, $models);
    }

    /**
     * Call before callbacks for each model and state.
     *
     * @param  array  $beforeCallbacks
     * @param  \Illuminate\Support\Collection  $models
     * @return void
     */
    protected function callBefore(array $beforeCallbacks, $models)
    {
        $states = array_merge(['default'], $this->activeStates);

        $models->each(function ($model) use ($states, $beforeCallbacks) {
            foreach ($states as $state) {
                $this->callBeforeCallbacks($beforeCallbacks, $model, $state);
            }
        });
    }

    /**
     * Call before callbacks for each model and state.
     *
     * @param  array  $beforeCallbacks
     * @param  \Illuminate\Database\Eloquent\Model  $model
     * @param  string  $state
     * @return void
     */
    protected function callBeforeCallbacks(array $beforeCallbacks, $model, $state)
    {
        if (! isset($beforeCallbacks[$this->class][$state])) {
            return;
        }

        foreach ($beforeCallbacks[$this->class][$state] as $callback) {
            $callback($model, $this->faker);
        }
    }

    /**
     * Determine if the given state has an "after" of "before" callback.
     *
     * @param  string  $state
     * @return bool
     */
    protected function stateHasAfterCallback($state)
    {
        return isset($this->afterMaking[$this->class][$state]) ||
            isset($this->beforeCreating[$this->class][$state]) ||
            isset($this->afterCreating[$this->class][$state]);
    }
}