Question

Is there a simple way to regenerate a Rails page cache? Destroying the cache is easy:

Person.each.all do |person|
  expire_page(:controller => 'yql', :action => 'feed', :id => person.id)
end

This deletes the cached files in the public directory. Right after I destroy them though, I want to recreate them. I don’t want to wait until they are viewed on the public web site.

Is there a simple rails way to do this.

Many thanks

Answer 1

A better solution is to expire the page, then hit it using curl. Because curl generates a new request, the Passenger only needs enough memory to render one feed. It also avoids going round the caching system.

def recache
  Person.find_each :batch_size => 100 do |person|
    expire_page( :controller => 'yql', :action => 'feed', :id => person.id )
    system("curl #{yql_feed_url person.id}")
  end
  render :text => "re-caching was successful"
end

Of course, this is a linux only solution. It’s also improtant to watch out for race conditions.