Question

我已经学会了如何使用Rails.cache.fetch函数来缓存数据库调用，但是，当我响应请求时，我包含了几个相关表的内容，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）调用Track.find（：all），但它是否还缓存了包含的事件和发言者？

Answer 1

不，它不是缓存那些。您必须将这些内容放入调用中以包含它们。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)

关联对象数组的示例：

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)

使用包含的缓存响应

1 个答案: