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Using XPath to point to the last child node

   1  doc.root.elements["entry[last()]"]

Reference: XPath Syntax [w3schools.com]
to ruby xpath function rexml last children Node element child by jrobertson on Aug 20, 2008

iterate through each child association of a active record class


   1  
   2  class ActiveRecord::Base
   3    def each_child
   4      self.class.reflect_on_all_associations.each do |assoc|
   5        case assoc.macro
   6          when :has_many then send(assoc.name).each { |child| yield child }
   7          when :has_one then yield send(assoc.name)
   8        end
   9      end
  10    end
  11  end
to ruby rails associations children by jerrett on Oct 25, 2006
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