ActiveSupport::Memoizable will be removed from Rails and has a lot of strange caveats that will ruin your day.

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Read more Show archive.org snapshot

Use the Memoizer gem Show archive.org snapshot instead. It works in all past and future Railses and has none of the annoying "features" of ActiveSupport::Memoizable. It just does memoization and does it well.

The syntax is similiar also:

class Foo
  include Memoizer
  
  def bar
      ...
  end
  
  memoize :bar
  
end

If you're using Ruby 2.1+, you can write this even shorter:

class Foo
  include Memoizer
  
  memoize def bar
      ...
  end

end

This is because def returns the method name as a symbol Show archive.org snapshot in 2.1+.