public function move($parentId, $leftSibling = null)
    {
        $parent = self::find($parentId);

        if ($this->parentNode()->id == $parent->id)
        {
            throw Exception('Temporary unavailable');

            if ($parent->hasChild())
            {
                if ($leftSibling === null)
                {
                    throw Exception('Sibling not found');
                }

                $rightKeyNear = $leftSibling->right_key;
            }
            else
            {
                $rightKeyNear = $parent->left_key;
                dd('par left');
            }
        }
        else
        {
            if ($parent->level == 0)
            {
                //перемещение в корень
                $rightKeyNear = self::max('right_key')->get();
            }
            else
            {
                $rightKeyNear = $parent->right_key - 1;
            }
        }

        $levelSkew = $parent->level - $this->level + 1;
        $keySkew = $this->right_key - $this->left_key + 1;

        $childIds = self::where('left_key', '>=', $this->left_key)->where('right_key', '<=', $this->right_key)->lists('id');

        if ($rightKeyNear > $this->right_key)
        {
            echo 'up';
            $editSkew = $rightKeyNear - $this->left_key + 1;

            // UPDATE my_tree SET right_key = right_key + $skew_tree WHERE right_key < $left_key AND right_key > $right_key_near
            self::where('right_key', '<', $this->left_key)->where('right_key', '>', $rightKeyNear)->update(array('right_key' => DB::raw('`right_key` + (' . $keySkew . ')')));

            // UPDATE my_tree SET left_key = left_key + $skew_tree WHERE left_key < $left_key AND left_key > $right_key_near
            self::where('left_key', '<', $this->left_key)->where('left_key', '>', $rightKeyNear)->update(array('left_key' => DB::raw('`left_key` - (' . $keySkew . ')')));

        }
        else
        {
            echo 'down';
            $editSkew = $rightKeyNear - $this->left_key - $keySkew + 1;

            // UPDATE my_tree SET right_key = right_key - $skew_tree WHERE right_key > $right_key AND right_key <= $right_key_near
            self::where('right_key', '>', $this->right_key)->where('right_key', '<=', $rightKeyNear)->update(array('right_key' => DB::raw('`right_key` - (' . $keySkew . ')')));

            // UPDATE my_tree SET left_key = left_key - $skew_tree WHERE left_key < $left_key AND left_key > $right_key_near
            self::where('left_key', '<', $this->left_key)->where('left_key', '>', $rightKeyNear)->update(array('left_key' => DB::raw('`left_key` - (' . $keySkew . ')')));
        }

        // UPDATE my_tree SET left_key = left_key + $skew_edit, right_key = right_key + $skew_edit, level = level + $skew_level WHERE id IN ($id_edit)
        self::whereIn('id', $childIds)->update(array('left_key' => DB::raw('`left_key` + (' . $editSkew . ')'), 'right_key' => DB::raw('`right_key` + (' . $editSkew . ')'), 'level' => DB::raw('`level` + (' . $levelSkew . ')')));
    }