緩存應答的用途包括

Question

我已經學會了如何使用Rails.cache.fetch功能緩存數據庫調用，但是，當我請求作出迴應，包括我的幾個相關的表的內容，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}}) 

這個緩存（我認爲）的呼叫Track.find（：所有），但它是否緩存包括的事件和揚聲器？

Answer 1

不，它沒有緩存這些。您必須將這些內容也包含在內。例如，像這樣：

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

關聯對象的數組的例子：

 
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)