Eloquent Parent-Child relationship on same model

Question

I have a model CourseModule, and each of the items are related to the same model.

Database Structure:

Relation in Model:

Answer 1

Model Function:

public function Children()
{ 
    return $this->hasMany(self::class, 'Parent', 'Id')->with('Children');
} 

Controller Function:

Menu::with("Children")->where(["Parent" => 0])->get();