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Figure 2-19. Vertical split views addressing the same buffer (unsaved) In Figure 2-20, the untitled1 buffer shown in Figure 2-19 has been saved to the file My First Buffer.txt, and a horizontal split pane has been created (using the Split Horizontally menu option or the Ctrl-W,- key combination) at the bottom of the window with a new unsaved buffer. The name of this new buffer defaults to the name untitled2, since the default1 name was used in creating the first new buffer and then renamed to My First Buffer.txt when it was saved to a file. As soon as you type a single character in the untitled2 pane/buffer, the buffer has new content, and an asterisk is appended to the name to indicate the buffer has changed. The zoom level in this buffer has been increased to 120%.

The logger library is a part of the standard library, so it comes with Ruby by default. To use it, you only need to place this line near the start of your program:

Listing 5-14. has_and_belongs_to_many Declaration in app/models/category.rb: http://gist.github.com/324057 class Category < ActiveRecord::Base has_and_belongs_to_many :articles end

require 'logger'

To use logger, you create Logger objects and then use the methods provided by the objects to report events that occur while your program is running. The first step is to get a Logger object.

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As part of creating an application skeleton, Rails added a file called db/seeds.rb , which defines some data you always need in your database. The seeds file contains Ruby code, so you can use the classes and methods including associations available in your models, such as create and update. Open it and create one user and a few categories so that it looks like Listing 5-15. Listing 5-15. The db/seeds.rb File: http://gist.github.com/324072 user = User.create :email => 'mary@example.com', :password => 'guessit' Category.create [{:name => 'Programming'}, {:name => 'Event'}, {:name => 'Travel'}, {:name => 'Music'}, {:name => 'TV'}] That should do nicely. You can load your seed data using the Rake task db:seed: $ rake db:seed If you need to add more default categories later, you can append them to the seed file and reload it. If you want to rerun the seed data, the trick is that the seeds file doesn t know whether the records already in the database have to be cleaned up; running rake db:seed again adds all records one more time, and you end up with duplicate user and categories. You should instead call rake db:setup, which re-creates the database and adds the seed data as you may expect. You can also use fixtures to perform this same task of loading sample data for your application. Fixtures are a textual representation of database records, used for testing. 10 talks more about fixtures. Let s give this a test run. Get your console ready, reload!, and run the following commands: >> => >> => >> => >> => >> => article = Article.last #<Article id: 8, title: "Associations", > category = Category.find_by_name('Programming') #<Category id: 1, name: "Programming", ..> article.categories << category [#<Category id: 1, name: "Programming", ..>] article.categories.any true article.categories.size 1

Loggers can write to standard output, standard error, or to a file. Just specify a file handle or filename to Logger.new. For example, here s how to write log messages directly to the screen or terminal:

require 'logger' logger = Logger.new(STDOUT)

Use this code to write log messages to file:

The mini-buffer is a special-purpose, interactive buffer enabling you to invoke a wide range of functions or behaviors in Intellipad. Think of it as a way of interacting or controlling your editor in command-line mode. I touched on it briefly in the sections titled The Find Commands and The Replace Command. You can see some of the available mini-buffer commands in Figure 2-22 below, and the entire set of mini-buffer commands is provided in Appendix B at the end of the book. You can also see this list by pressing the F1 key in any buffer view or clicking on the Help menu at the top of the window, then selecting the Commands option.

Here, you automatically associate a category with an article using the << operator. You can even do this from the category s side of the association. Try the following: >> => >> => >> => category.articles.empty false category.articles.size 1 category.articles.first.title "Associations"

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