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To accommodate resetting a password, we need to add a new field to the User model. This field will hold the generated random token that the system will e-mail to George when he forgets his password. Only with this token can he get to a page where he can change to a new password. Run the following code to generate the migration file: $ script/generate migration add_pw_reset_code_to_users exists db/migrate create db/migrate/010_add_pw_reset_code_to_users.rb Loaded suite script/generate Now open the new file (db/migrate/010_add_pw_reset_code_to_users.rb) and change it to add the new column, as follows: class AddPwResetCodeToUsers < ActiveRecord::Migration def self.up add_column :users, :pw_reset_code, :string, :limit => 40 end def self.down remove_column :users, :pw_reset_code end end Run rake db:migrate for the changes to take effect.

Figure 6 10. Where to initiate a custom sort So now we re ready to sort the database by Last Name but because we have duplicates in that field, we want to sort by First Name, too. As a result, we need to click the Add Level button, and select First Name on the new drop-down arrow alongside that field (Figure 6 11):

not see the XAML source, switch to that view so that you can edit the XAML. Within the root Grid of the Silverlight page, add grid row and column definitions (as explained in 3) to define four rows and two columns, as follows:

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Next, we need to change the User model in app/models/user.rb so that we can create a new reset code when needed: require 'digest/sha1' class User < ActiveRecord::Base # Virtual attribute for the unencrypted password attr_accessor :password, :password_forgotten # ... scroll 'til the end of the file def forgot_password self.password_forgotten = true create_pw_reset_code end def reset_password update_attributes(:password_reset_code => nil) end protected def create_pw_reset_code self.pw_reset_code = Digest::SHA1.hexdigest("secret-#{Time.now}") end # before filter def encrypt_password return if password.blank self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record self.crypted_password = encrypt(password) end def password_required crypted_password.blank || !password.blank end end In the beginning of the file, we declare an instance variable called @password_forgotten and accessor methods for it. Then we create a new method, forgot_password, which uses this variable to state whether a password reset has been requested. This method sets the @password_forgotten variable to true using its accessor method, and then calls the protected method create_pw_ reset_code to create a random, unique 40-character token for this resetting case. reset_password will be called when George has successfully completed the process. All it does is set the password_reset_code attribute to nil, awaiting the next time George s memory shows signs of deterioration.

But remember that the database contains two students named Ed Jones, and so we want to sort by still a third field (and that s all we have here), in this case, by Major (Figure 6 12):

<Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> <Grid.RowDefinitions> <RowDefinition Height="70" /> <RowDefinition Height="70" />

When we created UserNotifier in the beginning of the Reset Password user story implementation, the generator also created a file called user_observer.rb in app/models. Observers in Rails are classes that monitor the life cycle of ActiveRecord objects, somewhat similar to the filters for controllers. Observers support the following callback methods: after_create after_destroy after_save after_update after_validation after_validation_on_create after_validation_on_update before_create before_destroy before_save before_update before_validation before_validation_on_create before_validation_on_update You can call these callbacks directly in an ActiveRecord model, too: class MyModel < ActiveRecord::Base after_save :say_foo def say_foo logger.info "Foo-oo!" end end However, if your callback code gets longer and/or you want to implement similar behavior for multiple models, it s a good idea to extract the callbacks to an observer. Observers also give you more flexibility, since you can restrict the callbacks to happen only in certain controllers, as we will do in this section.

Figure 6 12. and now by three Now that we ve selected our sort fields, click OK. Here s what happens (Figure 6 13):

<RowDefinition Height="70" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="150" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> </Grid> 3. Next, add a Button control to the upper-left grid cell and a TextBlock control in the

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