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diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index d1b285101d..9ca4677c6f 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -352,9 +352,9 @@ def execute_grouped_calculation(operation, column_name, distinct) # :nodoc:
 
         select_values.concat group_columns.map { |aliaz, field|
           if field.respond_to?(:as)
-            field.as(aliaz)
+            Arel::Nodes::As.new(field, Arel::Table.new(aliaz))

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diff --git a/Gemfile b/Gemfile
index 8d3bc88..6272179 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,11 @@ group :development, :test do
   gem "debug", ">= 1.0.0", platforms: %i[ mri mingw x64_mingw ]
 end
 
+group :test do
+  gem 'rspec'

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# frozen_string_literal: true

paths = Dir[Rails.root.join('config/locales/models/defaults/*.yml')]
all_locales = paths.map { |path| YAML.load_file(path) }.inject(&:deep_merge)

# has_many用のデフォルトのlocaleを追加する
# config/locales/models/defaults/ja.ymlにモデル名が定義されている前提。
#
# activerecord/models にある値を複数形にして attributes に変換する
#

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module Enumerable
  def stable_sort_by
    sort_by.with_index { |item, index| [yield(item), index] }
  end
end

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module WithIndex
  extend ActiveSupport::Concern

  class IndexNotFound < StandardError; end

  class_methods do
    # インデックスを指定する
    #
    # @example
    #   User.where(...).use_index([:group_id, :created_at]).load

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# ActiveModel::Attributesは不要な抽象化が多くてメモリを大量に消費するため、軽量なActiveModel::Attributes相当のmoduleを用意する
# このmoduleは、ActiveModel::Attributesと比べて多くの機能(dirty trackingなど)がないため、readonlyなオブジェクトに利用するとよい
module LightweightActiveModelAttributes
  extend ActiveSupport::Concern

  include ActiveModel::AttributeMethods

  included do
    class_attribute :_attribute_types, :_default_attributes, instance_accessor: false
    self._attribute_types = {}

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# app/models/concerns/forced_attribute.rb
module ForcedAttribute
  extend ActiveSupport::Concern

  CONDITIONAL_OPTIONS = %i[if unless on].freeze

  class ForcedAttributeCallbacks
    # @param attributes [Hash<symbol, any>]
    def initialize(attributes = {})
      @attributes = attributes.freeze

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require 'parser/current'

RSpec.describe 'View spec' do
  describe 'partial view' do
    # partial viewの一覧
    let(:partial_views) do
      path = Rails.application.paths['app/views'].first
      Dir.glob("#{path}/**/_*.html.slim")
    end

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# app/models/concerns/enum_attribute.rb
module EnumAttribute
  extend ActiveSupport::Concern

  class_methods do
    # Example
    #   Model.enum(:state, [:pending, :complete])
    #   Model.states #=> { 'pending' => 'PENDING', 'complete' => 'COMPLETE' }
    #
    #   Model.new(state: 'PENDING').state #=> 'pending'

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# Usage
#   attribute :phone_number, :number_string
class NumberString < ActiveModel::Type::String
  # 与えられた値を数値のみの文字列、またはnilに変換する
  #
  # @param value [Object]
  #
  # @return [String, NilClass]
  def cast(value)
    super(value)&.remove(/\D/)