Helper methods for inspecting your methods

method_reflection.rb

class Object
  # List Methods defined directly in the receiver's class.
  def my_methods
    methods_from(self.class)
  end

  # List Methods with names matching the regex.
  def methods_matching(regex)
    methods_where { |meth| regex.match(meth.name.to_s) }
  end

  # Filter Methods by block.
  # The block receives Method objects, not just their names.
  def methods_where(&block)
    methods.keep_if { |name| block.call(method(name)) }
  end

  # object.methods_from SomeModule 
  #   List Methods defined in SomeModule
  #
  # object.methods_from /Some/ 
  #   List Methods defined in a module whose name matches the regex.
  #   Useful for finding methods from multiple modules in the same gem. (e.g. /^ActiveRecord/)
  def methods_from(source)
    if source.is_a? Regexp
      methods_where { |meth| source.match(String(meth.owner)) }
    else
      methods_where { |meth| meth.owner == source }
    end
  end

  # Find methods defined by attr_*
  def attr_methods
    methods_where do |meth|
      meth.arity < 2 &&
      meth.source_location &&
      (source = meth.source rescue nil) &&
      /attr_(reader|writer|accessor)/.match(source)
    end
  end
end