Laravel Nested Relationship on Factory for Testing

I got a problem, i have to admit i don't find any solution. I'm actually developping some testing for functionnalities and Factories are blocking me.

First I'm trying to add with factories an Entity called "Tasklist" which contains one or many "sections" which contains one or many "actions". I have a 3 level deep relationship.

Here are my factories:

    $factory->define(\App\V2\Models\Tasklist::class, function (\Faker\Generator $faker) {
    return [
        'id_course'        => \App\V2\Models\Program::all()->random(1)->id,
        'id_event'         => \App\V2\Models\Stage::all()->random(1)->id,
        'id_course_rounds' => \App\V2\Models\ProgramRound::all()->random(1)->id,
        'name'             => $faker->word,
        'display_name'     => $faker->word,
        'color'            => 0,
        'key'              => str_random(16),
        'auto_active'      => 1,
        'status'           => 1,
    ];
});

$factory->define(\App\V2\Models\TasklistSection::class, function (\Faker\Generator $faker) {
    return [
        'id_tasklist' => function(){
            return factory(\App\V2\Models\Tasklist::class)->create()->id;
        },
        'number'      => 1,
        'title'       => $faker->word,
        'text'        => $faker->text(100),
        'status'      => 1
    ];
});

$factory->define(\App\V2\Models\TasklistAction::class, function(\Faker\Generator $faker) {
    return [
        'id_tasklists_section' => factory(\App\V2\Models\TasklistSection::class)->create()->id,
        'number' => rand(1, 10),
        'title' => $faker->word,
        'percent' => $faker->numberBetween(0, 100),
        'status' => 1
    ];
});

In my testing class, i'm trying to generate a tasklist with 1 section with one action. The only way i found actually was something like that:

$task = factory(Tasklist::class, 2)->create()
            ->each(function($t){
               $t->sections()->save(factory(TasklistSection::class)->create()
                   ->each(function($s){
                     $s->actions()->save(factory(TasklistAction::class)->create());
                   })
               );
            });

To this code, if I delete the second each, it works, i got 2 tasklists with each 1 sections. In fact, the each is disturbing me.

I would like to create only one tasklist, with one or several sections with one or several actions on it.

But the each only accept Collection input the save method accepts only model input and not collection.

Does somebody have an idea how to deal with that ?

via Chebli Mohamed