public function scopeWithSubtreeById($q, $v = null)
{
if (!$v) {
return $q;
} else {
$root = Static::find($v);
if ($root->id) {
return $q->pathLike($root->{Static::getPathField()} . $root->{Static::getPathField()} . '*');
} else {
return $q;
}
}
}
