public function scopeWithPost($query)
{
$postTableName = (new Forum\Post())->getTable();
$thisTableName = $this->getTable();
return $query->whereExists(function ($query) use($postTableName, $thisTableName) {
$query->select(DB::raw(1))->from($postTableName)->whereRaw("{$postTableName}.post_id = {$thisTableName}.post_id");
});
}