where has morph laravel code example

Example: morph relation laravel

You may register the morphMap in the boot function of your 
App\Providers\AppServiceProvider class or create a separate service provider 
if you wish.

use Illuminate\Database\Eloquent\Relations\Relation;

Relation::morphMap([
    'post' => 'App\Models\Post',
    'video' => 'App\Models\Video',
]);