gistfile1.rb

class Author
  def invoke_inside(method, *args)
    self.send(method, *args)
  end
end

author = Article.first.author
def author.foobar
  "foobar"
end

author.object_id                              # => 9969140
author.respond_to?(:foobar)                   # => true
author.class                                  # => Author
author.invoke_inside(:object_id)              # => 9952490
author.invoke_inside(:respond_to?, :foobar)   # => false