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Norm: Well, clearly you ve broken the grammar definition in at least a couple of ways, since it is no longer generating M Graph output in the right pane. From what you see in the error list, it thinks the word with is a Lunchmeat token. Here s what I d suggest. Let s not add condiments into the system for the time being, and instead focus on refining the Lunchmeat and Bread syntax so that you get rid of the Blue on Blue problem, and the system is smart enough to exclude nonsense orders like ham on pastrami, even though ham and pastrami are both valid token values. Lola: Makes sense. One thing at a time. Norm changes the token definitions for Lunchmeat and Bread to be collections of a few of the sandwich makings that comprise some sandwiches on Lola s menu. And he removes the condiment fragment from the last order to keep things simple. Figure 3-21 shows the result.

The following line of code calls the class method on the numeric object 10. Even the literal number 10 is an object in this situation. The result demonstrates that 10 is an object of the Fixnum class.

Ruby s reflection, overriding, object orientation, and other dynamic features make it possible for developers to entirely override the behaviors of even built-in classes such as Fixnum. It s possible to make Fixnum objects work in totally different ways. You can override Fixnum to the point that 2 + 2 could well equal 5. Although some developers already experienced with languages such as Java and C see this as a downside, this level of control over the internals of the language gives Ruby developers a significant amount of power. The key is to use that power carefully.

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Specifies the error message shown if validation fails. Specifies when this validation happens. The default is :save. Other options are :create and :update.

As Ruby is an interpreted language, Ruby code is executed using the Ruby interpreter. On most platforms, that makes running a Ruby script as easy as this:

Note Ruby program files usually end with the extension of RB, although this isn t a strict requirement.

:message => "too long"

The Ruby interpreter has a number of options. You can ask the Ruby interpreter to print out its version details using the -v (version) option:

ruby 1.8.5 (2006-08-25) [i686-darwin8.8.1]

Figure 3-21. Redefining the Lunchmeat and Bread tokens Redefining the syntax in this way, where only valid names are given for the Lunchmeat and Bread tokens in the grammar definition, has trapped nonsense orders like Blue on Blue.

You can also execute Ruby commands directly from the command line, using -e:

You can use the :presence option to make sure a user has entered something into a field. This is very useful in many cases. You have those validations in the Article model for the title and body fields as shown in Listing 5-23. Listing 5-23. validates :presence => true Method in app/models/article.rb class Article < ActiveRecord::Base validates :title, :presence => true validates :body, :presence => true belongs_to :user has_and_belongs_to_many :categories has_many :comments scope :published, where("articles.published_at IS NOT NULL") scope :draft, where("articles.published_at IS NULL") scope :recent, lambda { published.where(["articles.published_at > ", 1.week.ago.to_date])} scope :where_title, lambda { |term| where("articles.title LIKE ", "%#{term}%") } def long_title "#{title} - #{published_at}" end end The default message is can t be blank.

ruby -e "puts 2 + 2"

You can learn more about the Ruby interpreter s command line options by typing man ruby (on Unix-related platforms) or by visiting a Web-based version of the Ruby man page at http://www.linuxcommand.org/man_pages/ruby1.html.

Note In Microsoft Windows, you might choose to associate the Ruby interpreter directly with any RB files

Often, you want to make sure a certain field is unique. The :uniqueness option validates whether the value of the specified attribute is unique across the system. You use this method in the User model to make sure each e-mail is unique, as shown in Listing 5-24. Listing 5-24. validates :uniqueness => true Method in app/models/user.rb: http://gist.github.com/326128 class User < ActiveRecord::Base validates :email, :uniqueness => true has_one :profile has_many :articles, :order => 'published_at DESC, title ASC', :dependent => :nullify has_many :replies, :through => :articles, :source => :comments end When the record is created, a check is performed to make sure no record exists in the database with the given value for the specified attribute email (that maps to a column). When the record is updated,

On Unix-related platforms, it s possible to add a shebang line as the first line of a Ruby script so that it can be executed without having to invoke the Ruby interpreter explicitly. For example:

Lola: Good this is looking much more specific now. But let s check something. What will it do with an order like ham on pastrami Norm: Okay, here it is. Norm enters the order Ham on Pastrami. in the DSL pane, with the resulting error shown in Figure 3-22.

#!/usr/bin/ruby puts "Hello, world!"

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