Ruby on Rails latest stable (v5.2.3) - 2 notes

Module deprecated or moved

This module is deprecated or moved on the latest stable version. The last existing version (v3.2.13) is shown here.

Sweepers are the terminators of the caching world and responsible for expiring caches when model objects change. They do this by being half-observers, half-filters and implementing callbacks for both roles. A Sweeper example:

class ListSweeper < ActionController::Caching::Sweeper
  observe List, Item

  def after_save(record)
    list = record.is_a?(List) ? record : record.list
    expire_page(:controller => "lists", :action => %w( show public feed ), :id => list.id)
    expire_action(:controller => "lists", :action => "all")
    list.shares.each { |share| expire_page(:controller => "lists", :action => "show", :id => share.url_key) }

The sweeper is assigned in the controllers that wish to have its job performed using the cache_sweeper class method:

class ListsController < ApplicationController
  caches_action :index, :show, :public, :feed
  cache_sweeper :list_sweeper, :only => [ :edit, :destroy, :share ]

In the example above, four actions are cached and three actions are responsible for expiring those caches.

You can also name an explicit class in the declaration of a sweeper, which is needed if the sweeper is in a module:

class ListsController < ApplicationController
  caches_action :index, :show, :public, :feed
  cache_sweeper OpenBar::Sweeper, :only => [ :edit, :destroy, :share ]
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June 29, 2008
5 thanks
March 24, 2009 - (>= v2.3.2)
2 thanks

if you get NameError: uninitialized constant ActionController::Caching::Sweeper

I got hit with this on an upgrade. Had a reference to ApplicationController::Base in development.rb (prod as well) which caused this problem http://rails.lighthouseapp.com/projects/8994/tickets/1977

Fix was to remove the loading of ApplicationController::Base and put it in an initializer (where it should have been).