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    Use concerns to keep your models manageable
  
        
  
    
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  | # autoload concerns | |
| module YourApp | |
| class Application < Rails::Application | |
| config.autoload_paths += %W( | |
| #{config.root}/app/controllers/concerns | |
| #{config.root}/app/models/concerns | |
| ) | |
| end | |
| end | |
| # app/models/concerns/trashable.rb | |
| module Trashable | |
| extend ActiveSupport::Concern | |
| included do | |
| default_scope where(trashed: false) | |
| scope :trashed, where(trashed: true) | |
| end | |
| def trash | |
| update_attribute :trashed, true | |
| end | |
| end | |
| # app/models/message.rb | |
| class Message < ActiveRecord::Base | |
| include Trashable, Subscribable, Commentable, Eventable | |
| end | 
  
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