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    <h3>Editing: DatabaseNotification.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Notifications;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;

class DatabaseNotification extends Model
{
    /**
     * The &quot;type&quot; of the primary key ID.
     *
     * @var string
     */
    protected $keyType = 'string';

    /**
     * Indicates if the IDs are auto-incrementing.
     *
     * @var bool
     */
    public $incrementing = false;

    /**
     * The table associated with the model.
     *
     * @var string
     */
    protected $table = 'notifications';

    /**
     * The guarded attributes on the model.
     *
     * @var array
     */
    protected $guarded = [];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'data' =&gt; 'array',
        'read_at' =&gt; 'datetime',
    ];

    /**
     * Get the notifiable entity that the notification belongs to.
     *
     * @return \Illuminate\Database\Eloquent\Relations\MorphTo
     */
    public function notifiable()
    {
        return $this-&gt;morphTo();
    }

    /**
     * Mark the notification as read.
     *
     * @return void
     */
    public function markAsRead()
    {
        if (is_null($this-&gt;read_at)) {
            $this-&gt;forceFill(['read_at' =&gt; $this-&gt;freshTimestamp()])-&gt;save();
        }
    }

    /**
     * Mark the notification as unread.
     *
     * @return void
     */
    public function markAsUnread()
    {
        if (! is_null($this-&gt;read_at)) {
            $this-&gt;forceFill(['read_at' =&gt; null])-&gt;save();
        }
    }

    /**
     * Determine if a notification has been read.
     *
     * @return bool
     */
    public function read()
    {
        return $this-&gt;read_at !== null;
    }

    /**
     * Determine if a notification has not been read.
     *
     * @return bool
     */
    public function unread()
    {
        return $this-&gt;read_at === null;
    }

    /**
     * Scope a query to only include read notifications.
     *
     * @param  \Illuminate\Database\Eloquent\Builder  $query
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function scopeRead(Builder $query)
    {
        return $query-&gt;whereNotNull('read_at');
    }

    /**
     * Scope a query to only include unread notifications.
     *
     * @param  \Illuminate\Database\Eloquent\Builder  $query
     * @return \Illuminate\Database\Eloquent\Builder
     */
    public function scopeUnread(Builder $query)
    {
        return $query-&gt;whereNull('read_at');
    }

    /**
     * Create a new database notification collection instance.
     *
     * @param  array  $models
     * @return \Illuminate\Notifications\DatabaseNotificationCollection
     */
    public function newCollection(array $models = [])
    {
        return new DatabaseNotificationCollection($models);
    }
}
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