# module ActiveRecord::Suppressor

ActiveRecord::Suppressor prevents the receiver from being saved during a given block.

For example, here's a pattern of creating notifications when new comments are posted. (The notification may in turn trigger an email, a push notification, or just appear in the UI somewhere):

    class Comment < ActiveRecord::Base
      belongs_to :commentable, polymorphic: true
      after_create -> { Notification.create! comment: self,
        recipients: commentable.recipients }
    end

That's what you want the bulk of the time. New comment creates a new Notification. But there may well be off cases, like copying a commentable and its comments, where you don't want that. So you'd have a concern something like this:

    module Copyable
      def copy_to(destination)
        Notification.suppress do
          # Copy logic that creates new comments that we do not want
          # triggering notifications.
        end
      end
    end