How to conditionally assign ActionController::Base.session in rails 2.3.3

问题

I have a rails app that has the following content in the config/initializers/session_store.rb file:

ActionController::Base.session = {
  :key         => '_app_session',
  :secret      => 'a really long string here',
  :expire_after => 2.minutes
}

ActionController::Base.session_store = :active_record_store

So during normal operations we are seeing ActiveRecord objects created in the database for each session. The issue is that we don't always want to create a session for requests - we'd like to be able to turn off session creation for automated requests. We are seeing thousands of session records in the database, one for each automated request. Prior to rails 2.3.3, the following was possible:

class ApplicationController < ActionController::Base
  session :off
  ...
end

but now in rails 2.3.3 "session :off" has been deprecated because sessions are now lazy-loaded - if you don't use them, they are not created. The problem seems to be that the session object is always assigned in the sessionstore.rb file, and therefore always created. If I remove the session assignment block from the config file, then no session records appear after an automated request. My question is, how can I move the configuration assignments to the session hash out of session_store.rb and into the ApplicationController class (or elsewhere) where the session can be conditionally assigned only if a request is not automated? I'm concerned that the session config data may be needed before the controller handler is executed. Where would I put the assignment of the session key values?

Thanks in advance for any help.

回答1:

The config/initializers are one-time configurations, they usually only ran once, on startup. According to the documentation, the lazy loading will only initialize the session if the "session" object is touched during a request.

Are you certain that you don't touch the session variable at all in your request cycle? (That is, in the filters, actions, helpers or templates). Also, do the session objects have some content that could tip you of as to where they were created?

回答2:

sorry for the "late" answer but I think is relevant for people landing here. was struggling with similar issues ever since session :off was removed from Rails.

I decide to "back-port" it for Rails 2.3+ as a plugin https://github.com/kares/session_off

来源：https://stackoverflow.com/questions/1275008/how-to-conditionally-assign-actioncontrollerbase-session-in-rails-2-3-3