Rails Issue #16588

gistfile1.txt

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
    gem 'rack', github: 'rack/rack'
    gem 'i18n', github: 'svenfuchs/i18n'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
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 do |t|
    t.string :time_zone
  end
end

class Post < ActiveRecord::Base
  has_many :comments
  
  composed_of :as_time_zone, :class_name => 'ActiveSupport::TimeZone',
    :mapping => %w(time_zone to_s)#,
    #:converter => Proc.new {|time_zone| puts time_zone; ActiveSupport::TimeZone.new(time_zone) }
end

class BugTest < Minitest::Test
  def test_composed_of_time_zone
    post = Post.new(:time_zone => "Eastern Time (US & Canada)")
    assert_equal "Eastern Time (US & Canada)", post.as_time_zone.name
    post.as_time_zone = ActiveSupport::TimeZone["Mountain Time (US & Canada)"]
    assert_equal "Mountain Time (US & Canada)", post.as_time_zone.name
  end
end