instance_methods_by_module.rb

class Object
  def self.instance_methods_by_module
    class_methods = []
    self.ancestors.reverse.each do |a|
      new_methods = a.instance_methods.sort
      class_methods.each do |cm|
        new_methods = new_methods - cm[1]
      end
      class_methods << [ a.name, new_methods ]
    end

    class_methods.reject {|cm| cm[0] == Kernel.name || cm[0] == Object.name }.reverse
  end
end