Are there any examples of using guessRelationship in Laravel factories

php
// database/factories/PostFactory.php
$factory->define(App\Models\Post::class, function (Faker\Generator $faker) {
    return [
        'title' => $faker->sentence,
        'content' => $faker->paragraph,
    ];
});

$factory->define(App\Models\Comment::class, function (Faker\Generator $faker) {
    return [
        'body' => $faker->paragraph,
    ];
});

$factory->guessRelationship = function ($related) {
    if ($related === App\Models\Post::class) {
        return 'comments';
    }
};

In this example, we define factories for `Post` and `Comment` models. We then use the `guessRelationship` property to specify a callback that will be used to determine the relationship name for a "has" relationship.

The callback receives the related model class name as a parameter and should return the relationship name. In this case, if the related model is `App\Models\Post`, we return `'comments'` as the relationship name.

Now, in your tests, you can use the dynamic relationship methods to create a `Post` with related `Comment` instances:

php
// tests/Feature/PostTest.php
public function testCreatePostWithComments()
{
    $post = factory(App\Models\Post::class)
        ->has(factory(App\Models\Comment::class, 3))
        ->create();

    $this->assertCount(3, $post->comments);
}

In this test, we're using the `->has()` method to create a `Post` instance with 3 associated `Comment` instances. The `guessRelationship` callback is used to determine the relationship name based on the related model class.

By leveraging the `guessRelationship` method, you can create more expressive and maintainable tests that accurately represent the relationships in your application.