Cascading Laravel Factories - Cascading Factory

ProjectFactory.php

<?php

/** @var \Illuminate\Database\Eloquent\Factory $factory */

use App\Client;
use App\Project;
use Faker\Generator as Faker;

$factory->define(Project::class, function (Faker $faker) {
    return [
        'title' => $faker->sentence,

        // cascade all dependent relations
        'client_id' => factory(Client::class)->create()->getKey()
    ];
});