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Ruby supports expressions in a style familiar to almost any programmer:

"a" + "b" + "c"

("a" * 5) + ("c" * 6)

Specifies the error message to add if the attribute is below the minimum Specifies the error message to add if the attribute is of the wrong size Specifies the error message to add if :minimum, :maximum, or :is is violated

You can assign the results of expressions to variables, which you can then use in other expressions. Method calls, variables, literals, brackets, and operators can all combine so long as subexpressions always feed values of the correct type into their parent expressions or provide methods that allow them to be coerced into the right types. The next section covers this topic in more depth. (Expressions are covered in depth in 3.)

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Figure 3-23. Error output from an undefined token Norm: So as soon as I type the first character S of the word Spam, the processor recognizes that there s no Lunchmeat token starting with S, and indicates an error. The next character, a lowercase p, doesn t occur as the first of a Lunchmeat token either, and so on. The prepositional word "on" is a required part of an order statement, but it still results in an error because it s not occurring after a valid Lunchmeat token. Lola: And what happens if you change the lowercase p to an uppercase P The Pa matches the first two characters in Pastrami. Norm: Excellent! I ll try it. He changes the word Spam to Spam in the last order, raising the error shown in Figure 3-24.

Ruby is a dynamic language, but unlike Perl, objects aren t converted between different classes automatically. For example, this expression is valid in Perl:

The :format option checks whether a value is in the correct format. Using this method requires familiarity with regular expressions (regex) or being able to steal other people s regular expressions. The classic example (and the one you need) is e-mail. Update the validates method as shown in Listing 5-26. Listing 5-26. validates :format Method in app/models/user.rb: http://gist.github.com/326146 class User < ActiveRecord::Base validates :email, :uniqueness => true, :length => { :within => 5..50 }, :format => { :with => /^[^@][\w.-]+@[\w.-]+[.][a-z]{2,4}$/i } has_one :profile has_many :articles, :order => 'published_at DESC, title ASC', :dependent => :nullify has_many :replies, :through => :articles, :source => :comments end Don t be put off by how complicated this looks. You pass in the :with option and a regex object to say what patterns you want to match.

However, in Ruby, you get an error response with the same expression:

TypeError: can't convert Fixnum into String from (irb):1:in `+' from (irb):1

In Ruby, you can only use objects that are of the same class or that support automatic translation between classes (coercion) in operations with one another.

TIP If you want to learn more about using regular expressions, you can find many tutorials and books on the subject. One good reference is Regular Expression Recipes (Apress, 2004).

However, Ruby comes with a set of methods that exist on many types of objects, which make conversion easy. For example:

In this example, the number 10 is converted to a string "10" in situ with the to_s method. Consider this inverse example, where you convert the string "20" into an integer object using the to_i method before adding 10 to it:

Figure 3-24. More syntax testing Norm: It takes the Pa fragment with no problem. It s looking for an s next, since that s the only character that matches with a valid Lunchmeat token. But when you type the m, it throws an error because it s looking for an s. Let s go ahead and add Spam as a lunchmeat and White as one of your breads, even though they ll be off-menu. Lola: Right.

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