Rails - Jan 2007 - caches_action :index for site root gets propagated to lower levels (how to stop?)

Hello all,

I am running a blog system which has its "/" (home page) cached like
this:

class ApplicationController < ActionController::Base
  before_filter :index_cache_expirer, :only => [:index]
  caches_action :index

so the site''s top page is caches for 60 seconds in my case
(index_cache_expirer is a home-made function to expire)

on the site, there is also a multi-user /admin area, which in turn has
its own controllers with :index action.

The problem is that effect of "caches_action :index" directive, which
is set inside the application.rb, somehow gets propagated to, say,
:index action of admin/posts controller, which causes problems because
a user is sometimes served by a page, which was cached by another user!
(like, logging in and checking his own posts list, just to be served by
a cached posts list, which was created for another user)

I might not be doing the caching the right way or something, but is
there a way to turn off that caches_action directive propagation to
"lower" level of the site (i.e. just make it work ONLY for the
application controller''s :index action, where it was defined in?)

Any suggestions are very appreciated as my site is now running with
caching off while I''m trying to find a good solution for the problem.

TIA,
Mike


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> Hello all,
>
> I am running a blog system which has its "/" (home page) cached
like
> this:
>
> class ApplicationController < ActionController::Base
>  before_filter :index_cache_expirer, :only => [:index]
>  caches_action :index
>
> so the site''s top page is caches for 60 seconds in my case
> (index_cache_expirer is a home-made function to expire)
>
> on the site, there is also a multi-user /admin area, which in turn has
> its own controllers with :index action.
>
> The problem is that effect of "caches_action :index" directive,
which
> is set inside the application.rb, somehow gets propagated to, say,
> :index action of admin/posts controller, which causes problems because
> a user is sometimes served by a page, which was cached by another user!
> (like, logging in and checking his own posts list, just to be served by
> a cached posts list, which was created for another user)
>
> I might not be doing the caching the right way or something, but is
> there a way to turn off that caches_action directive propagation to
> "lower" level of the site (i.e. just make it work ONLY for the
> application controller''s :index action, where it was defined in?)
>
> Any suggestions are very appreciated as my site is now running with
> caching off while I''m trying to find a good solution for the
problem.
Well, *every* controller you have inherits from ApplicationController (see 
the "class" line at the top).  So by putting this into 
ApplicationController you''re telling it to apply to *every*
controller''s
index action.

Move that caches_action line out of ApplicationController and put it into 
whatever controller serves up your home page.

-philip

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Philip,
thank you very much!
Indeed! Somehow I just didn''t happen to think about this inheritancy as
the source of the problem! Now thinking about it, it is almost a
miracle I didn''t have more problems with the program, since I have put
pretty alot of various stuff inside the ApplicationController. Got to
rebuild my app''s structure a little I guess.

Thanks again!
Mike.

On Jan 23, 5:03 am, Philip Hallstrom
<r...-SUcgGwS4C16SUMMaM/qcSw@public.gmane.org>
wrote:
> > Hello all,
>
> > I am running a blog system which has its "/" (home page)
cached like
> > this:
>
> > class ApplicationController < ActionController::Base
> >  before_filter :index_cache_expirer, :only => [:index]
> >  caches_action :index
>
> > so the site''s top page is caches for 60 seconds in my case
> > (index_cache_expirer is a home-made function to expire)
>
> > on the site, there is also a multi-user /admin area, which in turn has
> > its own controllers with :index action.
>
> > The problem is that effect of "caches_action :index"
directive, which
> > is set inside the application.rb, somehow gets propagated to, say,
> > :index action of admin/posts controller, which causes problems because
> > a user is sometimes served by a page, which was cached by another
user!
> > (like, logging in and checking his own posts list, just to be served
by
> > a cached posts list, which was created for another user)
>
> > I might not be doing the caching the right way or something, but is
> > there a way to turn off that caches_action directive propagation to
> > "lower" level of the site (i.e. just make it work ONLY for
the
> > application controller''s :index action, where it was defined
in?)
>
> > Any suggestions are very appreciated as my site is now running with
> > caching off while I''m trying to find a good solution for the
problem.Well, *every* controller you have inherits from ApplicationController
(see
> the "class" line at the top).  So by putting this into
> ApplicationController you''re telling it to apply to *every*
controller''s
> index action.
>
> Move that caches_action line out of ApplicationController and put it into
> whatever controller serves up your home page.
> 
> -philip

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