Laravel 8 factory class is not overriding the parameters while creating the factories - laravel-8

Question

I am developing a web application using Laravel 8. I have noticed that quite a lot of things have changed in Laravel 8 including factories.
I have a factory class MenuCategoryFactory for my MenuCategory model class with the following definition.
<?php
namespace Database\Factories;
use App\Models\Menu;
use App\Models\MenuCategory;
use Illuminate\Database\Eloquent\Factories\Factory;
class MenuCategoryFactory extends Factory
{
/**
* The name of the factory's corresponding model.
*
* #var string
*/
protected $model = MenuCategory::class;
/**
* Define the model's default state.
*
* #return array
*/
public function definition()
{
return [
'name' => $this->faker->name,
'menu_id' => Menu::factory()->create(),
];
}
}
In my code (database seeder class), I am trying to override the menu_id as follow while I am creating the factories.
$restaurant = Restaurant::first();
MenuCategory::factory()->create([
'menu_id' => $restaurant->menu->id
]);
But it is not using the value I passed, $restaurant->menu->id. Instead, it is creating a new menu. What is wrong missing in my code and how can I fix it?

Answer 1

In your factory definition, don't call ->create(), instead set it up like this:
public function definition()
{
return [
'name' => $this->faker->name,
'menu_id' => Menu::factory(),
];
}
Then you you should be able to set up related models (assuming you the relationships setup in the model) like this:
$restaurant = Restaurant::first();
MenuCategory::factory()->for($restaurant)->create();

Answer 2

Change the definition to
public function definition()
{
return [
'name' => $this->faker->name,
'menu_id' => function() {
Menu::factory()->create()->id,
}
];
}
then you can replace the value