php - データベースに保存するときにLaravelデータベース通知値がモデルオブジェクトに保持されない

Question

だから私はデータベースに通知を保存しようとしています。しかし、値を持つモデルのオブジェクトが通知クラスに渡されると、データは保持されず、次のメッセージが表示されます

postsIlluminate \ Database \ QueryException (HY000) SQLSTATE[HY000]: 一般エラー: 1364 フィールド 'post_title' にデフォルト値がありません (SQL: ( updated_at, ) 値に挿入created_at(2017-09-21 15:58:01, 2017) -09-21 15:58:01)))

Post_titleと Post_descriptionがありますが、ここには表示されません。

以下は私の通知クラスです。奇妙なことに、投稿オブジェクトのダンプを取得すると、コンストラクターですべての投稿関連情報を取得しています

<?php

namespace App\Notifications;

use Carbon\Carbon;
use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notifiable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;

class PostCreated extends Notification
{
    use Queueable,Notifiable;

    protected $post;
    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct($post)
    {
        $this->post = $post;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['database'];
    }
    /**
     * Get the array representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function toArray($notifiable)
    {
        return [
            'post_id' => $this->post->id,
            'user_id' => $this->post->user_id,
        ];
    }
}

さらに情報が必要な場合はお知らせください。 編集：投稿モデル

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Spatie\Feed\FeedItem;

/**
 * @property array|string post_title
 * @property array|string post_description
 * @property array|string is_featured
 * @property array|string is_rejected
 * @property mixed id
 */
class Post extends Model implements FeedItem
{
    use SoftDeletes;

    /**
     * The attributes that should be mutated to dates.
     *
     * @var array
     */
    protected $dates = ['deleted_at','created_at','updated_at','starting_time','ending_time'];
    protected $fillable = [
        'post_title', 'post_description', 'ebook_title', 'ebook_link', 'country_id', 'state_id', 'diary_id'
    ];

    public function user()
    {
        return $this->belongsTo('App\Models\User');
    }

    public function hashTags()
    {
        return $this->belongsToMany('App\Models\HashTag', 'hash_tag_post', 'post_id', 'hash_tag_id')->withTimestamps();
    }

    public function getRelatedHashTagsAttributes()
    {
        return $this->tags->pluck('id');
    }

    public function categories()
    {
        return $this->belongsToMany('App\Models\Category', 'category_post', 'post_id', 'category_id')->withTimestamps();
    }

    public function state()
    {
        return $this->belongsTo('App\Models\Category', 'state_id', 'id');
    }

    public function country()
    {
        return $this->belongsTo('App\Models\Category', 'country_id', 'id');
    }

    public function sliders()
    {
        return $this->belongsToMany('App\Models\Slider', 'slider_post', 'post_id', 'slider_id')->withTimestamps();
    }

    public function comments()
    {
        return $this->hasMany('App\Models\Comment');
    }

    public function postUploadedDatas()
    {
        return $this->hasMany('App\Models\PostUploadedData');
    }

    public function likes()
    {
        return $this->hasMany('App\Models\Like');
    }

    public function hasAction($user)
    {
        if ($this->likes()->where('user_id', $user)->first())
        {
            return true;
        }
        return false;
    }

    public function diaries()
    {
        return $this->belongsToMany('App\Models\Post', 'diary_post', 'post_id', 'diary_id');
    }

    public function getFeedItemId()
    {
        return $this->id;
    }

    public function getFeedItemTitle()
    {
        return $this->post_title;
    }

    public function getFeedItemSummary()
    {
        return $this->post_description;
    }

    public function getFeedItemUpdated()
    {
        return $this->updated_at;
    }
    public function getFeedItemAuthor() : string
    {
        return "";
    }

    public function getFeedItemLink()
    {
        return action('TravellersInn\PostController@getFeedItems', [$this->url]);
    }

    public function getTipsFeed()
    {
        return Post::where('contant_id','LIKE','%'.'3'.'%')->get();
    }
    public function getImagesFeed()
    {
        return Post::where('contant_id','LIKE','%'.'2'.'%')->get();
    }
    public function getVideosFeed()
    {
        return Post::where('contant_id','LIKE','%'.'4'.'%')->get();
    }
        public function getEbooksFeed()
    {
        return Post::where('contant_id','LIKE','%'.'6'.'%')->get();
    }



}