Question

I’m trying to implement a Cache Sweeper which would filter a specific controller action.

class ProductsController < ActionController  
    caches_action :index  
    cache_sweeper :product_sweeper  

    def index 
        @products = Product.all 
    end 

    def update_some_state
      #... do some stuff which doesn't trigger a product save, but invalidates cache
    end
end 

Sweeper Class:

class ProductSweeper < ActionController::Caching::Sweeper
    observe Product

    #expire fragment after model update
    def after_save
       expire_fragment('all_available_products')   
    end

    #expire different cache after controller method modifying state is called.
    def after_update_some_state
        expire_action(:controller => 'products', :action => 'index') 
    end
end

The ActiveRecord callback ‘after_save’ will work fine, but the callback on the controller action ‘after_update_some_state’ never seems to be called.

Answer 1

Looks like I was just missing the controller name when trying to get the callbacks for controller actions working. My Sweeper should be:

class ProductSweeper < ActionController::Caching::Sweeper
    observe Product

    #expire fragment after model update
    def after_save
       expire_fragment('all_available_products')   
    end

    #expire different cache after controller method modifying state is called.
    def after_products_update_some_state
        expire_action(:controller => 'products', :action => 'index') 
    end

    #can also use before:
    def before_products_update_some_state
        #do something before. 
    end
end