You could probably hook up something similar using ActiveSupport::Notification 
and instrumenting the create action in the Posts controller, or 
alias_method_chain the create method on Posts to do what you want.


On Aug 1, 2012, at 4:27 PM, mcasimir <[email protected]> wrote:

> Hi,
> I wish to ask you if could be a good idea to introduce in Rails a simple 
> complement to Sweepers that could reduce the effort of expiring cache, 
> something like that:
> 
> Rails.cache.fetch("recent_posts", :expires_when => [:create, Post])
> 
> The above example could setup a callback to expire "recent_posts" each time 
> that a Post is created.
> 
> Sometimes I would like to rely on something like that to expire cache in 
> place of sweepers/observers.
> What do you think? There may be downsides with this approach?
> 
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