I'm retrieving data from two tables which are categories and subcategories.

categories cat_id contains inside the subcategories table as a foreign key.

here is my code form Category model:

class Category extends Model
{
    protected $table = 'categories';

    public function subcategories()
    {
        return $this->hasMany(Subcategory::class, 'categories_id');
    }
}

here is my code form SubCategory model:

class Subcategory extends Model
{
    protected $table = 'sub_categories';

    public function category()
    {
        return $this->belongsTo(Category::class, 'categories_id');
    }

This is how I retrieve data from my controller:

 $treeView = Category::with(['subcategories'])->get();

this is how my .blade.php part looks like:

@foreach($treeView as $category)
                @if($category->has('subcategories'))
                    <li class="treeview">
                        <a href="#"><i class="fa fa-link"></i> <span>{{ $category->category_name }}</span>
                            <i class="fa fa-angle-left pull-right"></i></a>
                        <ul class="treeview-menu">
                            @foreach($category->subcategories as $subcategory)

                                <li class=""><a href="#">{{$subcategory->sub_category_name}}</a></li>

                            @endforeach
                        </ul>
                    </li>
                @else
                    <li><a href="#"><i class="fa fa-link"></i> <span>{{ $category->category_name }}</span></a></li>
                @endif

            @endforeach

As above html structure I m going to construct a tree view if any category has sub categories else show the category without a tree view . But I get all the categories with or without subcategories inside a tree view.. Can anyone suggest a way please...