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Here's an activerecord test that not passing: ## validations_test.rb -- activerecord [ruby] def test_validates_length_of_using_maximum_utf8 with_kcode('UTF8') do Topic.validates_length_of :title, :maximum => 5 t = Topic.create("title" => "一二三四五", "content" => "whatever") assert t.valid? t.title = "一二34五六" assert !t.valid? assert t.errors.on(:title) assert_equal "is too long (maximum is 5 characters)", t.errors["title"] end end ## output 5) Failure: test_validates_length_of_using_maximum_utf8(ValidationsTest) [test/cases/validations_test.rb:1004:in `test_validates_length_of_using_maximum_utf8' test/cases/validations_test.rb:1442:in `with_kcode' test/cases/validations_test.rb:1000:in `test_validates_length_of_using_maximum_utf8' ./test/cases/../../../activesupport/lib/active_support/testing/setup_and_teardown.rb:57:in `run']: <false> is not true. The error happens on this statement: assert t.valid? ## ar_utf8.rb [ruby] # this is a plain program that should duplicate the same error # but it doesn't -- everything works correctly. require 'rubygems' require 'activerecord' def with_kcode(kcode) if RUBY_VERSION < '1.9' orig_kcode, $KCODE = $KCODE, kcode begin yield ensure $KCODE = orig_kcode end else yield end end @logger = Logger.new $stderr ActiveRecord::Base.logger = @logger ActiveRecord::Base.colorize_logging = false # GRANT ALL PRIVILEGES ON my_activerecord_test.* to 'rails'@'localhost'; pool = ActiveRecord::Base.establish_connection( :adapter => RUBY_PLATFORM =~ /java/ ? 'jdbcmysql' : 'mysql', :username => 'rails', :encoding => 'utf8', :database => 'my_activerecord_test' ) ActiveRecord::Schema.define do drop_table :posts if pool.connection.table_exists?(:posts) create_table :posts do |t| t.string :subject t.text :body end end class Post < ActiveRecord::Base validates_length_of :subject, :maximum => 5 end with_kcode('UTF8') do p1 = Post.create(:subject => "一二三四五", :body => 'this is the body') len1 = p1.subject.length len2 = p1.subject.mb_chars.length puts "length: #{len1}, #{len2}" puts p1.valid? puts p1.errors.on(:subject) p2 = Post.find(:first) p2.subject = "一二34五六" puts p2.valid? puts p2.errors.on(:subject) end ## output $ jruby ar_utf8.rb SQL (1.3ms) SET SQL_AUTO_IS_NULL=0 -- drop_table(:posts) SQL (2.5ms) DROP TABLE `posts` -> 0.0037s -> 0 rows -- create_table(:posts) SQL (2.2ms) CREATE TABLE `posts` (`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY, `subject` varchar(255), `body` text) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin -> 0.0072s -> 0 rows SQL (2.1ms) INSERT INTO `posts` (`subject`, `body`) VALUES('一二三四五', 'this is the body') length: 15, 5 true nil Post Load (1.6ms) SELECT * FROM `posts` LIMIT 1 false is too long (maximum is 5 characters)

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