Question

I’ve learned how to use the Rails.cache.fetch function to cache database calls, however, when I respond to the request, I include the contents of several related tables, for example

tracks = Rails.cache.fetch("events-by-track", :expires_in => 12.hours) do
  Track.find(:all)
end
respond_with(tracks, :include => {:events => {:include => :speaker}})

This caches (I think) the call Track.find(:all), but is it also caching the included events and speaker?

Answer 1

No, it is not caching those. You’ll have to put those inside the call to include them as well. For example, something like this:

tracks = Rails.cache.fetch("events-by-track", :expires_in => 12.hours) do
  Track.find(:all, :include => {:events => :speaker})
end
respond_with(tracks)

Example of array of associated objects:

tracks, events = Rails.cache.fetch("events-by-track", :expires_in => 12.hours) do
  tracks = Track.find(:all, :include => [:events])
  events = tracks.collect(&:events)
  tracks, events
end
respond_with(tracks)