add if condition in model laravel code example

Example 1: laravel 8 orderby

$flights = App\Models\Flight::where('active', 1)
               ->orderBy('name', 'desc')
               ->take(10)
               ->get();

Example 2: query builder laravel

use Illuminate\Database\Eloquent\Builder;

public function scopeFakePersons(Builder $query): Builder
{
  return $query->where('is_fake', 1);
}