# File lib/better_nested_set.rb, line 147
147:         def root?
148:           parent_id = self[acts_as_nested_set_options[:parent_column]]
149:           (parent_id == 0 || parent_id.nil?) && (self[acts_as_nested_set_options[:left_column]] == 1) && (self[acts_as_nested_set_options[:right_column]] > self[acts_as_nested_set_options[:left_column]])
150:         end