laravel_demo/app/Models/Article.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Article extends Model
{
	use SoftDeletes;

	const STATUS_DRAFT		= 0;
	const STATUS_PENDING	= 1;
	const STATUS_PUBLISHED	= 2;
	const STATUS_ARCHIVE	= 3;

	function scopePending($query) {
		$query->where("status", static::STATUS_PENDING);
	}

	function scopePublished($query) {
		$query->where("status", static::STATUS_PUBLISHED);
	}

	function comments() {
		return $this->morphMany(Comment::class, "commentable");
	}
}