Answer.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use App\User;
use App\Question;
use App\UploadedFile;

class Answer extends Model
{

  protected $fillable = [
    'text', 'question_id'
  ];

  public function user()
  {
    return $this->belongsTo(User::class);
  }

  public function question()
  {
    return $this->belongsTo(Question::class);
  }

  public function files()
  {
    return $this->morphMany(UploadedFile::class, 'parent');
  }

}