issue_26417.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  gem "rails", github: 'rails/rails' # path: "/Users/prathamesh/Projects/sources/rails"
  gem "sqlite3"
end

require "active_support"
require "active_record"
require "active_model"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.datetime :modified_date
    t.datetime :create_date
  end
end

class Post < ActiveRecord::Base
  alias_attribute :updated_at, :modified_date
  alias_attribute :created_at, :create_date
end

class BugTest < ActiveSupport::TestCase
  def test_association_stuff
    post = Post.create! modified_date: DateTime.current
    assert_not_equal "posts/1", post.cache_key
  end
end