How do I apply a ruby memoization pattern to code this code

Question

I am upgrading an app from Rails 3.2.11 to 3.2.17 and I'm getting the following error message:

DEPRECATION WARNING: ActiveSupport::Memoizable is deprecated and will be removed in future releases, simply use Ruby memoization pattern instead.

I know what memoization is, and the offending code appears to be the following:

def api
  @client.vm_by_name(name) if cluster
end
memoize :api

I'm not quite sure how to memoize this using a ruby memoization pattern. The previous techs have memoized the api method. Anyone got any ideas?

score 3 · Accepted Answer · edited May 23 '17 at 11:53

3

Use this:

def api
  @api ||= @client.vm_by_name(name) if cluster
end

edited May 23 '17 at 11:53

Community

answered May 01 '14 at 16:40

Damien Roche

1 Answers1