Which Ruby memoize pattern does ActiveSupport::Memoizable refer to?

Question

So in Rails 3.2, ActiveSupport::Memoizable has been deprecated.

The message reads:

DEPRECATION WARNING: ActiveSupport::Memoizable is deprecated and
will          


        

Answer 1

Just an addition to the top answer, to memoize a class method use the following pattern:

class Foo
  class << self
    def bar
      @bar ||= begin
        # ...
      end
    end
  end
end