active_record_save_scope_names.rb

# config/initializers/active_record_save_scope_names.rb
ActiveSupport.on_load(:active_record) do
  module SaveScopeNames
    extend ActiveSupport::Concern
    module ClassMethods
      attr_reader :scope_names
      def scope(*args)
        @scope_names ||= []
        @scope_names << :"#{self.name.downcase}##{args.first}"
        super
      end

      def all_scope_names
        ActiveRecord::Base.subclasses.map(&:scope_names).flatten.compact
      end
    end
  end

  ActiveRecord::Base.include(SaveScopeNames)
end