gist.rb

# app/models/application_record.rb
class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true

  cattr_accessor :skip_callbacks
end

# app/models/concerns/user_notifiable.rb
module UserNotifiable
  included do
      after_commit :notify_users, unless: :skip_callbacks
  end
end

# db/seeds.rb
ApplicationRecord.skip_callbacks = true