Helper functions for safely working with node attribute keys.

util.rb

    def has_nested_key?(key, hash)
      hash = hash.to_hash
      if has_indeterminate_key?(key, hash)
        return true
      end

      hash.values.each do |v|
        if v.is_a?(Hash) && has_nested_key?(key, v)
          return true
        end
      end

      return false
    end

    def self.has_indeterminate_key?(key, hash)
      if hash.has_key?(key.to_s) || hash.has_key?(key.to_sym)
        return true
      end
    end