详解Laravel设置多态关系模型别名的方式

> select  from taggables;
+--------+-------------+---------------+
| tag_id | taggable_id | taggable_type |
+--------+-------------+---------------+
|  1 |   1 | App\Post  |
|  2 |   1 | App\Post  |
+--------+-------------+---------------+

use Illuminate\Database\Eloquent\Relations\Relation;

Relation::morphMap([
 'posts' => 'App\Post',
 'videos' => 'App\Video',
]);

public function getMorphClass()
{
 $morphMap = Relation::morphMap();
 if (! empty($morphMap) && in_array(static::class, $morphMap)) {
  return array_search(static::class, $morphMap, true);
 }
 return static::class;
}

app/Traits/UseTableNameAsMorphClass.php
<?php
namespace App\Traits;
trait UseTableNameAsMorphClass
{
 public function getMorphClass()
 {
  return $this->getTable();
 }
}

<?php
namespace App;
use App\Traits\UseTableNameAsMorphClass;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
 use UseTableNameAsMorphClass;

 //...
}