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rails activerecord observer usage

admin 11月 12, 2020 0

要使Observer工作，第一种做法是在controller里声明，这样unit test就无法加载此observer到console中

class  < ActiveRecord::Observer
  observe Flower
  def after_create(model)
    # model.do_something!
  end
end
# controller(s)
class FlowerController < ApplicationController
  observer :flower_observer
end

第二种做法可以加载observer到console中：

# app/models/foo_bar.rb
class FooBar < ActiveRecord::Base
end
FooBarObserver.instance

最后一个方法是在config/environment.rb中加载此observer:

config.active_record.observers = :flower_observer