Baum\Node::destroyDescendants PHP Method

    public function destroyDescendants()
    {
        if (is_null($this->getRight()) || is_null($this->getLeft())) {
            return;
        }
        $self = $this;
        $this->getConnection()->transaction(function () use($self) {
            $self->reload();
            $lftCol = $self->getLeftColumnName();
            $rgtCol = $self->getRightColumnName();
            $lft = $self->getLeft();
            $rgt = $self->getRight();
            // Apply a lock to the rows which fall past the deletion point
            $self->newNestedSetQuery()->where($lftCol, '>=', $lft)->select($self->getKeyName())->lockForUpdate()->get();
            // Prune children
            $self->newNestedSetQuery()->where($lftCol, '>', $lft)->where($rgtCol, '<', $rgt)->delete();
            // Update left and right indexes for the remaining nodes
            $diff = $rgt - $lft + 1;
            $self->newNestedSetQuery()->where($lftCol, '>', $rgt)->decrement($lftCol, $diff);
            $self->newNestedSetQuery()->where($rgtCol, '>', $rgt)->decrement($rgtCol, $diff);
        });
    }