lib/ancestry/instance_methods.rb
def child_ancestry
      # New records cannot have children
      raise Ancestry::AncestryException.new('No child ancestry for new record. Save record before performing tree operations.') if new_record?

      if self.send("#{self.ancestry_base_class.ancestry_column}#{IN_DATABASE_SUFFIX}").blank?
        id.to_s
      else
        "#{self.send "#{self.ancestry_base_class.ancestry_column}#{IN_DATABASE_SUFFIX}"}/#{id}"
      end
    end
def child_ancestry
      # New records cannot have children
      raise Ancestry::AncestryException.new('No child ancestry for new record. Save record before performing tree operations.') if new_record?

      if self.send("#{self.ancestry_base_class.ancestry_column}#{IN_DATABASE_SUFFIX}").blank?
        id.to_s
      else
        "#{self.send "#{self.ancestry_base_class.ancestry_column}#{IN_DATABASE_SUFFIX}"}/#{id}"
      end
    end
The ancestry value for this record's children (before save)
 This is technically child_ancestry_was