Fragment caching and pagination


#1

I’m just getting my hands dirty with caching. The pages I want to cache
have
some user specific data on them (for example “log out”). That sent me
down
the route of fragment caching. One of the things I want to pagination is
a
paginated list. My question is how is pagination and query strings
handled
with fragment caching? Does each page get its own fragment and query
string
identifier?

thanks,

Steve
http://www.smarkets.net


#2

Steve
>… how is pagination and query strings handled with fragment
caching?
> Does each page get its own fragment and query string identifier?

Yes. Each page related fragment is cached separately.

Here is what works for me:

In the view: (event/list.rhtml, a paginated view, with an optional
‘year’ filter. )

line 1:   <% cache(:controller => 'event', :action => 'list', :group

=> visitor.group, :page => params[:page], :year => params[:year]) do%>

In the Controller:
class EventController < ApplicationController
cache_sweeper :event_sweeper, :only => [:edit, :update, :new,
:create, :destroy]

In the sweeper:
class EventSweeper < ActionController::Caching::BaseSweeper
observe Event

    def after_save(record)
        expire_fragment  %r{event/list.*}
        expire_home_page
    end
    def after_destroy(record)
        expire_fragment  %r{event/list.*}
        expire_home_page
    end

end


#3

Excellent. Just what I was looking for.

Steve