query builder in model, laravel

I'm trying to do a query within a model, then call it in the url with

namespace App\Models;
use Eloquent as Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Collection;

class TeachingPoint extends Model
{
use SoftDeletes;

protected $with = ['testRelation'];

public function testRelation()
{
      $table = DB::table('test_table')->where(xxxx)->->get();
      foreach($table as $data)
      {
        etc...
      }
      return $data;
}

I need to do it on the model, is this possible? Or I have to do it with "attribute" or in the controller itself

Thank you

via Chebli Mohamed