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<..nothing or a junk result..> Because the Japanese characters are represented by more than one byte each, Ruby cannot work with them properly. Instead, it just picks off the first byte with [0] as opposed to the first character and tries to convert that meaningless byte s value back into a character. One workaround provided by Ruby 1.8 is called jcode. This mechanism comes with Ruby and puts Ruby into a mode that has bare support for UTF-8 (or other character encodings, mostly related to Japanese, but we won t consider those here). UTF-8 is the most commonly used system of representing Unicode characters. By default, UTF-8 characters only take up one byte (for English alphabet characters, say), but, where necessary, will use more than one byte (for Japanese, Chinese, and so on). Using jcode you can make regular expressions UTF-8 aware:

# Add foreign key reference to publishers table execute 'ALTER TABLE books ADD CONSTRAINT fk_books_publishers FOREIGN KEY ( publisher_id ) REFERENCES publishers( id ) ON DELETE CASCADE' end end def self.down drop_table :authors_books drop_table :books end end

This result ensues:

trait Buildable { def handler: PartialFunction[Any, Unit] = Map.empty }

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Setting the $KCODE global variable to 'u' (for UTF-8) and loading jcode gives regular expressions awareness of UTF-8 characters, giving you each multibyte character correctly in the scan loop. Unfortunately this awareness spreads only to regular expressions, meaning that other Ruby methods such as length, first, last, and picking individual characters from strings using [] don t work properly on these strings. There have been some noble projects to give strings methods that work in the same way as the default ones, but on UTF-8 strings. Most of these use regular expressions to get their results, and are therefore a lot slower than the built-in Ruby methods. For example:

Next, we define the messages for a generic listener:

$KCODE = 'u' require 'jcode'

Note This migration in Listing 3-1 uses MySQL-specific SQL. This means that you would need to change

Here s the result:

case class Add(who: Actor) case class Remove(who: Actor)

In this example you override the reverse method in class String and implement your own using scan. This yields the correct result when working with the UTF-8 encoding.

Note Further information about this technique is available at http://redhanded.hobix.com/

We define the ListenerMgt trait that extends Buildable, has private state and implements the updateListeners method, and requires the updateMessage method to be implemented:

The migration file creates two new tables, books and authors_books (authors_books in the join table, as explained in the Many-to-Many Relationship section later in this chapter). To ensure data integrity, we also add foreign key constraints to the tables. ActiveRecord doesn t support adding foreign keys constraints to tables. You need to add foreign keys using the ALTER TABLE SQL command and the ActiveRecord execute method, which can execute raw SQL on the database. The say_with_time method is used to print out the time it takes to execute the commands that add foreign keys to the database schema. Also note that ISBN numbers must be unique and that this is ensured by setting the :unique option to true.

In mid-2006 a more permanent workaround was developed for Ruby 1.8 called ActiveSupport::Multibyte, now a standard part of the Ruby on Rails framework. (You can also download the library in a standalone form at https://fngtps.com/projects/ multibyte_for_rails) ActiveSupport::Multibyte provides a basic proxy method called chars that gives access to the true characters within a string (rather than simply each block of 8 bits). It allows you to write examples like these:

We implement the handler method by composing the superclass s handler with this class s message handler:

With this result:

puts " ".chars[1..2]

Tip ActiveRecord has a built-in time stamping behavior that is triggered for database columns named

override def handler = super.handler orElse { case Add(who) => listeners = who :: listeners who ! updateMessage case Remove(who) => listeners -= who }

Here s the result:

There is a more full discussion of ActiveSupport::Multibyte at http://www. ruby-forum.com/topic/81976.

We update all the listeners:

Note Conversion between different character encodings is provided by the iconv library, covered in

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