lib/active_record_survey/node/answer/rank.rb
def num_below
			count = 0
			self.node_maps.each { |node_map|
				node_map.children.each { |child|
					# Child is one of us as well - include it and check its children
					if child.node.class.ancestors.include?(self.class)
						count = count + 1 + child.node.num_below
					end
				}
			}
			count
		end
def num_below
			count = 0
			self.node_maps.each { |node_map|
				node_map.children.each { |child|
					# Child is one of us as well - include it and check its children
					if child.node.class.ancestors.include?(self.class)
						count = count + 1 + child.node.num_below
					end
				}
			}
			count
		end
Calculate the number of Rank nodes below this one