A detailed article about caching in Rails3:
Caching in Rails is covered occasionally. It is covered in very basic detail in the caching guide. Advanced caching is left to reader. Here’s where I come in.
- Page Caching: not applicable to most real world apps
- Action Caching: a bit more useful than Page Caching, runs before_filters
- Fragment Caching: Store parts of views
- Rails.cache: Store anything at this level
Link: BroadcastingAdam – Advanced Caching in Rails via broadcastingadam.com