Setting class variable in Controller Ruby

Question

I have a controller class

class MyController < ApplicationController

    def firstMethod
       @obj = #get friends list from FB
    end

    def secondMethod
     puts @obj
    end
end

So in /my/firstMethod , i have

  <%= link_to "Likes","/my/secondMethod" %>

The method is called and page is rendered but "puts @obj" display blank.

I know one way is to use before_filter but since its a expensive operation i want to get list of friends only once.

Any pointers ?

Harshit

You could use a class variable (@@obj), but unless you have verified by profiling that this is a performance bottleneck, you should stick with a before_filter. Also, Rails has caching, which allows you to cache a lot more than your friends list. Also note that in development mode, your controllers are reloaded at every request, so you can only use @@obj as a cache — Niklas B.
– Niklas B., Commented Dec 20, 2011 at 20:30
@Niklas Are you sure that a class variable only lives during the time of one request? — Nicolas Guillaume
– Nicolas Guillaume, Commented Dec 20, 2011 at 20:44
@NicolasGUILLAUME: yes, I just tested it. Only in development mode, of course. — Niklas B.
– Niklas B., Commented Dec 20, 2011 at 23:45

Nicolas Guillaume · Accepted Answer · 2011-12-20 20:43:24Z

2

I would use a before_filter and store the result in cache.

You can also use the session to store the friend list but I would avoid that except if the stored list has a controlled length.

answered Dec 20, 2011 at 20:43

Nicolas Guillaume

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1 Comment

harshit Over a year ago

storing in cache is what i would prefer than session size size is pretty huge.

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