Caching and Application/Site Controllers

Ruby Apps Radiant CMS
1

I’ve written an extension that needs to do some processing on every
call to a page in the cms. Basically, it checks for a cookie and
redirects the user if a certain value is present. I’m running into a
problem where that piece of code is not being called after the first
call to the app. I believe it’s because of caching…

When i set cache_timeout to small, it works:
SiteController.cache_timeout = 1.second

The extension is a SiteController extension:

def activate
Page.class_eval {
SiteController.send :include,
IpRedirect::SiteControllerExt
}
end

The controller:

module SiteControllerExt

def self.included(base)
  base.class_eval do
    base.send(:include, InstanceMethods)
    before_filter :lookup_preferred_language_and_redirect
end

module InstanceMethods
  def lookup_preferred_language_and_redirect
      ....
  end

Is it possible that the before_filter is not called when caching is
turned on? Is there a way to make sure
that :lookup_preferred_language_and_redirect is called regardless of
caching?

I’m on 0.8.2 for this one.

Thanks in advance!
Stan

2

As far as I understand if there is a cached page already available the
radian sitecontroller doesn’t even get executed. The server spits out
the generated page.

If you wish to have code executed everytime for every page access, you
pretty much have to disable caching.
If it’s only afew specific pages that require this, you want to
declare your own page type and define the following:

def cache?
false
end

3

So do you think it’s possible to add the logic to a middleware object and add
the middleware object to the stack?

Actually… wouldn’t that work as long as it was inserted before
Rack::Cache? Can someone more familiar with the caching layer
confirm/deny?

4

On Fri, Oct 22, 2010 at 9:18 AM, Josh F. [email protected]
wrote:

So do you think it’s possible to add the logic to a middleware object and
add the middleware object to the stack?

Actually… wouldn’t that work as long as it was inserted before
Rack::Cache? Can someone more familiar with the caching layer confirm/deny?

Yes. As long as it’s injected before the cache, you’re golden.

5

Awesome. These seems to have fixed it:

extension_config do |config|
if config.middleware.include? Radiant::Cache
config.middleware.insert_before(Radiant::Cache, GeoIpRedirect)
else
config.middleware.use GeoIpRedirect
end
end

I’ll reply back if my Qa team finds out it doesn’t. :slight_smile:

6

So do you think it’s possible to add the logic to a middleware object
and
add the middleware object to the stack?

Put something like the following in the extension?

extension_config do |config|
config.middleware.use GeoIpRedirect
end

I’m pretty new to middleware, so I’m not certain that this will get
called
every time…

Stan