blue-twilight/app/PhotoComment.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class PhotoComment extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'commentor_name',
        'commentor_email',
        'comment_text'
    ];

    public function approvedBy()
    {
        return $this->belongsTo(User::class, 'approved_user_id');
    }

    public function createdBy()
    {
        return $this->belongsTo(User::class, 'created_user_id');
    }
}