为我的Rails应用程序实现观察者模式 [英] Implementing Observer Pattern for my Rails App

问题描述

我目前正在使用Rails 3.0.7和ruby 1.9.2，并制作一个Rails App，其中包含在从FlowPlayer渲染时从数据库加载的视频.以及基于视频的一组幻灯片.现在，我想将幻灯片与视频同步.对于计时，我要求用户输入每张幻灯片的计时.因此，我想知道是否可以通过将某种中心时间作为主体，将视频和幻灯片作为观察者来使用观察者模式?

I am currently using rails 3.0.7 and ruby 1.9.2 and making a rails App which contains a video being loaded from a database while being rendered by FlowPlayer. and a set of slides based on the video. Now, I wanted to synchronize the slides with the video. For the timings, I am asking the user to enter the timings of each slide. So, I was wondering if i could use observer pattern for this by making a sort of central time as the subject and the video and slides as the observers?

虽然在网上浏览了许多教程后，这个概念似乎是正确的，但我无法继续进行或提出有关编码的想法.

While, the concept seems correct after going through a number of tutorials on the net, I am not able to proceed or ge ideas on coding it.

任何帮助将不胜感激.

推荐答案

基本上，您有两种选择:

basically, you have two choices:

使用ActiveRecord的回调(before_save，after_save等)或创建观察者

use ActiveRecord's callbacks (before_save, after_save, etc..) or create an observer

# app/observers/some_model_observer.rb
class SomeModelObserver < ActiveRecord::Observer
  observe :your_model # the model you're observing

  def after_create(record)
  end

  # other ActiveRecord callbacks
end

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