Skip the memoization

[Jared Fine]

Figured I would share since I just got bit by this and took a little
while to figure out. The jist is don't use memoization on your session
models for authlogic. What happens is that memoize freezes the object
thus resulting in frozen object errors when you try to do things like
session.destroy.

GOOD:
class ApplicationController < ActionController::Base
...
private
def current_session
return @current_user_session if defined?(@current_user_session)
@current_user_session = Session.find
end
def current_user
return @current_user if defined?(@current_user)
@current_user = current_session.try(:user)
end
...
end

NO GOOD:
class ApplicationController < ActionController::Base
...
extend ActiveSupport::Memoizable
private
def current_session
@current_user_session = Session.find
end
memoize :current_session
def current_user
@current_user = current_session.try(:user)
end
memoize :current_user
...
end

[Kris Leech]

This is a good tip it might be worth putting in the documentations
somewhere maybe under 'troubleshooting'...

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