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You still need to do a little work on your User model. You can apply many of the techniques described in this chapter, such as custom methods to allow you to perform user authentication, and validation methods to make sure your data stays clean. When you created the user migration (Listing 5-2), you added a field called password. This field stores a plain-text password which, if you think about it, isn t very secure. It s always a good idea to encrypt any sensitive data so it can t be easily read by would-be intruders. You deal with the encryption in the User model itself, but the first thing you do is rename the field in the database from password to hashed_password. This is so you can create a custom accessor called password with which to set the password while maintaining a field to store the encrypted version in the database. The plain-text password is never saved. To accomplish this, you create a migration. From the terminal, issue the following command to create the new migration: $ rails generate migration rename_password_to_hashed_password Next, fill in the migration as shown in Listing 5-36. Listing 5-36. Migration to Rename password to hashed_password in db/migrate/20100309052120_rename_password_to_hashed_password.rb: http://gist.github.com/326261 class RenamePasswordToHashedPassword < ActiveRecord::Migration def self.up rename_column :users, :password, :hashed_password end def self.down rename_column :users, :hashed_password, :password end end Run the migration using the rake db:migrate command, as follows: $ rake db:migrate == RenamePasswordToHashedPassword: migrating ===============================

The expression is true because both subexpressions are true. 2 is equal to 2, and 1 is not equal to 2. You can also check that one thing is not equal to another with the inequality operator !=:

(2 == 2) && (1 != 2)

Ruby supports a few different forms of flow control. In this section you ll see several techniques you can use for branching and looping. (All the topics in this section are covered in more depth in 3.)

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Lola: This is starting to look a little more realistic now, Norm. But I have one more request: I need a way of adding an additional main ingredient. For instance, someone might order grilled tofu and Portabella in pita, or ham and pepperoni on French. What would it take to do that Norm: One character. Lola: Surely you jest, mon neveu. Norm: No, I m serious. Let s add Portabella to the grilled tofu in the last order, and see if it breaks as you expect it to. Figure 3-28 shows the resulting error.

-- rename_column(:users, :password, :hashed_password) -> 0.0558s == RenamePasswordToHashedPassword: migrated (0.0560s) ========================

The simplest form of conditional execution is with just a single line using if or unless:

This example won t print anything to the screen because 2 is not equal to 1. In this case, if performs the comparison before the rest of the line is executed. This usage will be familiar to Perl programmers (indeed, that s where this construction came from), but might appear back-to-front to developers from languages such as C. Ruby also supports a multiline construction that s more familiar to non-Perl or Ruby coders:

This multiline construction is less space efficient than the previous, single-line construction, but it allows you to put multiple lines between the condition and the end of the block, which isn t possible with the end of line technique. Pascal coders should note the absence of a begin, though otherwise the style is similar to that in Pascal. You can also write the preceding conditional logic in a single-line way, but it s a messy style and rarely seen:

Next, update your User model so that it looks like Listing 5-37. You program all the userauthentication methods you need for allowing users to log in. Let s look at the code first and then see in detail what you ve done.

This technique is only shown for completeness. Try not to use it!

unless is the opposite of if. It executes code if the expression is false (or nil), rather than true. Some coders think of it as if not, because unless acts like if with the expression negated.

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