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However, a more powerful technique is when you create servlets that exist in their own class and have more control over the requests and responses made to them:

require 'webrick' class MyServlet < WEBrick::HTTPServlet::AbstractServlet def do_GET(request, response) response.status = 200 response.content_type = "text/plain" response.body = "Hello, world!" end end server = WEBrick::HTTPServer.new( :Port => 1234 ) server.mount "/", MyServlet trap("INT"){ server.shutdown } server.start

Figure 5-4. The many-to-many relationship between articles and categories Let s start by adding the Category model. This is a simple matter of generating the model, consisting of just a name column. Run the following command inside your application root: $ rails generate model Category name:string Look at the generated migration in db/migrate/20100307001138_create_categories.rb; it s pretty familiar territory at this point. You need another migration to create the join table. Do that now by running the following command: $ rails generate migration create_articles_categories Remember that when you use create_table inside a migration, you don t need to specify the primary key, because it s created automatically. Well, in the case of a join table, you don t want a primary key. This is because the join table isn t a first-class entity in its own right. Creating tables without primary keys is the exception and not the rule, so you need to explicitly tell create_table that you don t want to create an id. Take a close look at the call to create_table in Listing 5-12. You pass in option :id => false, which prevents create_table from creating the primary key; also, you add the appropriate fields. Listing 5-12. The db/migrate/20100307002156_create_articles_categories.rb File: http://gist.github.com/324042 class CreateArticlesCategories < ActiveRecord::Migration def self.up create_table :articles_categories, :id => false do |t| t.references :article t.references :category end end

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This code is more elaborate, but you now have access to request and response objects that represent both the incoming request and the outgoing response. For example, you can now find out what URL the user tried to access in his or her browser, with such a line:

response.body = "You are trying to load #{request.path}" request.path contains the path within the URL (for example, /abcd from http://127.0.0.1:1234/abcd), meaning you can interpret what the user was trying to

Any Intellipad pane can be zoomed in or out. There are several ways to do this, but the easiest way is to press the Ctrl key while moving the scroll wheel on your mouse. Pressing the Ctrl key while scrolling forward will zoom the active pane in (increasing the scale, or effective size of the font), while scrolling back will have the opposite effect. (This also works in Quadrant, which I ll be talking about in the next chapter.) The zoom level, which defaults to 100%, is displayed on the right of the title line of the pane. The location is to the left of the mode name on the pane s title line, indicated by the cursor in Figure 2-18. Executing the Zoom function under the View menu causes the mini-buffer pane to appear at the bottom of the Intellipad window. (I wrote about this feature in the earlier section titled The Find Commands ) The Zoom() function is automatically invoked in the mini-buffer, with the argument set to the active pane s current zoom setting. The current zoom setting is highlighted, as shown in Figure 2-18, so that you can easily change it to a different level by typing the new value. Note that you can also zoom by clicking the Zoom setting, displayed as a percentage. Clicking this will invoke the mini-buffer with the Zoom function in exactly the same way as zoom can be invoked from the View menu.

request, call a different method, and provide the correct output. Here s a more elaborate example:

def self.down drop_table :articles_categories end end You use the references method in the create_table block instead of using integer. It s just another notation that uses the association name as parameter instead of a field name; so, t.references :article is the same as t.integer :article_id. Feel free to pick the syntax you prefer. Go ahead and run the migrations: $ rake db:migrate == CreateCategories: migrating ===============================================

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