example.rb

module ParanoidDeletion
  
  def self.included(klass)
     klass.send :include, InstanceMethods
     klass.send :extend, ClassMethods
     klass.send :default_scope, klass.where(deleted_at: nil)
  end

  module InstanceMethods
    def destroy_without_callbacks
      self.deleted_at = Time.now.utc
      update_without_callbacks
    end

    def destroy
      run_callbacks :destroy do
        destroy_without_callbacks
      end
    end

    def deleted?
      !deleted_at.nil?
    end
  end

  module ClassMethods 
    def find_with_deleted *args
     self.with_exclusive_scope { find(*args) }
    end

  end
  
end