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Frequently, dependencies exist between models. For instance, in your blog application, if you delete users, you want to make sure they don t have articles in the system. Said another way, an Article is dependent on its User. You can let Active Record take care of this for you automatically by specifying the :dependent option to your association. Listing 5-10 shows all the options to has_many :articles, including the :dependent option. Listing 5-10. :dependent Option Added to has_many: http://gist.github.com/324020 class User < ActiveRecord::Base has_one :profile has_many :articles, :order => 'published_at DESC, title ASC', :dependent => :destroy end By passing in the symbol :destroy, you say not only that articles are dependent, but also that when the owner is deleted, you want to call the destroy method on every related article. This ensures that any *_destroy callbacks on the article instances are called (the chapter talks about callbacks later, in the Making Callbacks section). If you want to skip the callbacks, you can use the :delete option in place of :destroy, which deletes the records directly via SQL. Let s say you want to set the foreign-key column (user_id) to NULL in the articles table, instead of completely destroying the article. Doing so essentially orphans the articles. You can do this by using the :nullify option in place of :destroy. If you don t use the :dependent option, and you delete a user with associated articles, you break foreign-key references in your articles table. For this application, you want to keep the as :nullify option, as per Listing 5-11. Listing 5-11. :dependent Option Set to :nullify: http://gist.github.com/324023 class User < ActiveRecord::Base has_one :profile has_many :articles, :order => 'published_at DESC, title ASC', :dependent => :nullify end

require 'iconv' Iconv.open('utf-8', 'iso-8859-1') do |converter| utf8_string = "This is a test" iso_string = converter.iconv(utf8_string) end

You can also use iconv in an immediate form to convert strings on a single line:

Standard library documentation for iconv: http://www.ruby-doc.org/stdlib/

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Sometimes, the relationship between two models is many-to-many. This describes a pattern where two tables are connected to multiple rows on both sides. You use this in the blog application to add categories to articles. If you wanted to allow only one category to be selected for a given article, you could use has_many. But you want to be able to apply multiple categories. Think about this for a minute: an article can have many categories, and a category can have many articles where does the belongs_to go in this situation Neither model belongs to the other in the traditional sense. In Active Record speak, this kind of association is has_and_belongs_to_many (often referred to as habtm for short).

Wikipedia article with more general information about iconv:

logger is a library developed by Hiroshi Nakamura and Gavin Sinclair that provides sophisticated logging features to Ruby applications. It supports automatic log rotation and multiple urgency levels, and can output to file, to standard output, or to standard error handles. Ruby on Rails uses logger as its main logging system, but you can use it from any Ruby application.

Figure 2-17. Detail of Intellipad Full Screen icons: restored size and position Here s a description of the action performed by clicking each of these control icons: Latches and drags the window to a new position. This icon is displayed only when the Intellipad window is restored to its previous (not full display) size, but disappears when the window is actually at full-screen size. Cursoring over it will . Left-clicking while this cause the cursor to change to a grab and drag cursor cursor is displayed allows you to grab and drag the window to a different position on the screen. Restores the default Intellipad view format, with menu bar and pane titles. Minimizes the window. Restores window to its previous size and position (prior to setting to Full Screen view). After this function is executed, this icon will change to a Full Screen icon: . Closes the Intellipad window. If any buffers are unsaved, you will be prompted whether you want to save them.

The has_and_belongs_to_many association works by relying on a join table that keeps a reference to the foreign keys involved in the relationship. The join table sits between the tables you want to join: articles and categories. Not surprisingly, then, the join table in this case is called articles_categories. Pay particular attention to the table name. It s formed from the names of each table in alphabetical order, separated by an underscore. In this case, the a in articles comes before the c in categories hence, articles_categories. Figure 5-4 illustrates this relationship.

Caution Because your test program doesn t output valid HTTP, it s likely to fail with many Web browsers, particularly on Windows. However, if you understand how to use the telnet program, you can use telnet 127.0.0.1 1234 to see the result. Otherwise, continue to the next example, where valid HTTP is returned for Web browsers to view.

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