# File lib/symetrie_com/acts_as_better_nested_set.rb, line 456
        def root?
          parent_id = self[parent_col_name]
          (parent_id == 0 || parent_id.nil?) && self[right_col_name] && self[left_col_name] && (self[right_col_name] > self[left_col_name])
        end