缓存应答的用途包括

Question

我已经学会了如何使用Rails.cache.fetch功能缓存数据库调用，但是，当我请求作出回应，包括我的几个相关的表的内容，例如

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

这个缓存（我认为）的呼叫Track.find（：所有），但它是否缓存包括的事件和扬声器？

Answer 1

不，它没有缓存这些。您必须将这些内容也包含在内。例如，像这样：

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

关联对象的数组的例子：

 
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)