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the same check is made, but disregarding the record itself. The default error message is #{value} has already been taken. The :uniqueness option can also validate whether the value of the specified attributes are unique based on multiple scope parameters. For example, you can use it to make sure a teacher can be on the schedule only once per semester for a particular class: class Schedule < ActiveRecord::Base validates :teacher_id, :uniqueness => { :scope => [:semester_id, :class_id] } end

You can take this script, give it a simple filename such as hello (no RB extension needed), make the file executable (using chmod), and run it directly using its filename rather than having to invoke the Ruby interpreter explicitly. 10 covers this technique in more depth. More information about the shebang line specifically is available at http://en.wikipedia.org/wiki/Shebang_(Unix).

With the normal Ruby interpreter also comes an interactive Ruby interpreter called irb. This allows you to write Ruby code in an immediate, interactive environment where the results of your code are given as soon as you type it. Here s an example irb session:

# irb irb(main):001:0> test => nil irb(main):002:0> => 20 irb(main):003:0> => false irb(main):004:0>

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Sometimes you want to validate the length, or size, of a field entry. You can do this by using the :length option. You use this method in the User model to specify a valid number of characters for an e-mail address, as shown in Listing 5-25. The option for specifying a size range is :within. Listing 5-25. validates :length Method in app/models/user.rb: http://gist.github.com/326138 class User < ActiveRecord::Base validates :email, :uniqueness => true, :length => { :within => 5..50 } has_one :profile has_many :articles, :order => 'published_at DESC, title ASC', :dependent => :nullify has_many :replies, :through => :articles, :source => :comments end If you want to ensure only the minimum or maximum, you can use the :minimum or :maximum option. Table 5-8 lists the most common :length option s options. Table 5-8. Options for validates :length

puts "test"

irb gives you the results of methods and expressions immediately. This makes it an ideal tool for debugging or putting together quick snippets of code, and for testing concepts.

Figure 3-22. Testing a syntactically nonconforming sandwich order Norm: Clearly, that s not accepted. It breaks the syntax rules of the grammar definition. And look at the error description: the processor knows Pastrami is a Lunchmeat token, but it occurs in an unexpected part of the order. See what happens when I highlight the error list line in the Error List pane It highlights the offending word in the DSL view, along with underlining the word with red squiggles. Lola: Great, it seems to be getting a little smarter, and you ve clearly gotten rid of the Blue on Blue issue. Let s do a different test. I have a good Wall Street customer who loves Spam on white bread. He always comes in with big take-out orders, so even though it offends my sense of nutritional aesthetics, I m going to have to stock some Spam and white bread. I ll just have to keep it off-menu. I know you don t have this in your test orders, but let s see what the system does with a Spam on white order. Norm: You got it. As usual, let s try the new order statement before I change the grammar and see what kind of error is generated. He types in the order Spam on White. raising the errors shown in the Error List pane at the bottom of Figure 3-23.

Expressions, logic, and flow control make up a significant part of any developer s tools in any programming language. This section looks at how Ruby implements them.

Specifies the minimum size of the attribute Specifies the maximum size of the attribute Specifies the exact size of the attribute Specifies the valid range (as a Ruby Range object) of values acceptable for the attribute Specifies that the attribute may be nil; if so, the validation is skipped Specifies the error message to add if the attribute exceeds the maximum

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