Rails 3 Observer — looking to learn how to implement an Observer for multiple models

问题

I'd like to add an Auditor Observer which does an action anytime after_create for 3 models (books, characters, authors)...

I recently heard of the Observer capability but can't find any documentation on the ability. Is it support in Rails 3?

How do I create an Auditor Observer that does something after_create for 3 models?

Thanks

回答1:

Rails observers are sweet, You can observe multiple models within a single observer

First, you need to generate your observer:

rails g observer Auditor

Then, in your fresh auditor_observer.rb file define the models you wish to observe and then add the after_create callback.

 class AuditorObserver < ActiveRecord::Observer
   observe :model_foo, :model_bar, :model_baz

   def after_create(record)
    #do something with `record`
   end
 end 

In application.rb add

config.active_record.observers = :auditor_observer

And It should work.

来源：https://stackoverflow.com/questions/3826260/rails-3-observer-looking-to-learn-how-to-implement-an-observer-for-multiple-m