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We don t need the two mail methods that exist in the mailer, so we delete them and add our own method, as follows: class UserNotifier < ActionMailer::Base @@session = ActionController::Integration::Session.new def forgot_password(user) setup_email(user) @subject += "Password reset" @body[:url] = @@session.url_for(:controller => "account", :action => "reset_password", :id => user.pw_reset_code, :only_path => false) end protected def setup_email(user) @recipients = "#{user.email}" @from = "admin@emporium-books.com" @subject = "[Emporium] " @sent_on = Time.now @body[:user] = user end end forgot_password is the mail method we deliver when George or someone from his staff requests a password reset. In the method, we set the subject for the mail, as well as define the password-reset URL sent in the e-mail message. Note that as url_for is an instance method for ActionController controllers, we can t call it directly from inside a mailer. However, with the trickery on the first line, we create a new ActionController::Integration::Session object through which we can call url_for, and store it in a class variable, which can be used everywhere inside our mailer class. We also change the setup_email method a bit, to accommodate our application. Next, we need to create a template for the mail body. Create a new template called forgot_password.rhtml in app/views/user_notifier and put the following code in it: Dear <%= @user.login %>, Click the following link to reset your password at Emporium: <%= @url %> As you can see, the @body hash contents from the mailer method have been extracted to instance variables in the template, so that, for example, @body[:user] became @user and @body[:url] became @url.
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Now that we have a mailer class and template ready, we can deliver a password-reset e-mail message by calling UserNotifier.deliver_forgot_password(@user_object). Rails will automatically retrieve the mailer method name after the deliver_ part in the method call, and deliver the mail prepared by that method.
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Tip If you want to delay the delivery of the e-mail (for example, because you have a mail sweeper that takes care of the deliveries), you can use create_ instead of deliver_ in the method call, and you will get a TMail object in return. For more information about TMail, see http://i.loveruby.net/en/ projects/tmail.
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Updating the User Model
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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.
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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.
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