Laravel belongsToMany with Morph

I have Package Model and a package can get multi services and multi modules.

I was going to try to make table like this.

Schema::create('package_has_items', function (Blueprint $table) {
            $table->id();
            $table->unsignedBigInteger('package_id');
            $table->string('model_type');  // App\Service, or App\Module
            $table->unsignedBigInteger('model_id');
            $table->timestamps();
        });

I am going to make relationship between Package and Service, Package and Module so that I can use attach(), sync() function easily.

And I am going to get services and modules from a package with $package->services, $package->modules.

How can I make relationship in Package Model?

via Chebli Mohamed