# 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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