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Let s play with these new methods from the console so you can get a better idea of how this comes together: >> user = User.first => #<User id: 1, email: "user@example.com", ..> >> user.password = 'secret' => "secret" >> user.password_confirmation = 'secret' => "secret" >> user.save => true >> user.hashed_password => "e5e9fa1ba31ecd1ae84f75caaa474f3a663f05f4" >> User.authenticate('user@example.com', 'secret') => #<User id: 1, email: "user@example.com", > >> User.authenticate('user@example.com', 'secret2') => nil >> second_user = User.last => #<User id: 2, email: "mary@example.com", > >> second_user.update_attributes(:password => 'secret', :password_confirmation => 'secret') => true >> User.authenticate('mary@example.com', 'secret') => #<User id: 2, email: "mary@example.com", > When you ask the User model to authenticate someone, you pass in the e-mail address and the plain-text password. The authenticate method hashes the given password and then compares it to the stored (hashed) password in the database. If the passwords match, the User object is returned, and authentication was successful. When you try to use an incorrect password, nil is returned. In 7, you write code in your controller to use these model methods and allow users to log in to the site. For now, you have a properly built and secure back end for the way users authenticate. With the validation in the User model, the db/seeds.rb file also needs to be updated to make sure it follows the rules expected in the model. While we are at it, we also add some code to create a few articles. Update your db/seeds.rb file so that it looks like Listing 5-38. Listing 5-38. Current Seeds File in db/seeds.rb: http://gist.github.com/387374 user = User.create :email => 'mary@example.com', :password => 'guessit', :password_confirmation => 'guessit' Category.create [{:name => 'Programming'}, {:name => 'Event'}, {:name => 'Travel'}, {:name => 'Music'}, {:name => 'TV'}] user.articles.create :title => 'Advanced Active Record', :body => "Models need to relate to each other. In the real world, ..", :published_at => Date.today user.articles.create :title => 'One-to-many associations', :body => "One-to-many associations describe a pattern ..", :published_at => Date.today
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user.articles.create :title => 'Associations', :body => "Active Record makes working with associations easy..", :published_at => Date.today
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Reviewing the Updated Models
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You ve made a lot of changes to your models, so let s make sure we re on the same page before you move on. Look at the Article, Category, and Comment models in Listings 5-39, 5-40, and 5-41, and make sure yours match. Listing 5-39. Current Article Model in app/models/article.rb class Article < ActiveRecord::Base validates :title, :presence => true validates :body, :presence => true belongs_to :user has_and_belongs_to_many :categories has_many :comments scope :published, where("articles.published_at IS NOT NULL") scope :draft, where("articles.published_at IS NULL") scope :recent, lambda { published.where("articles.published_at > ", 1.week.ago.to_date)} scope :where_title, lambda { |term| where("articles.title LIKE ", "%#{term}%") } def long_title "#{title} - #{published_at}" end def published published_at.present end end Listing 5-40. Current Category Model in app/models/category.rb class Category < ActiveRecord::Base has_and_belongs_to_many :articles default_scope order('categories.name') end Listing 5-41. Current Comment Model in app/models/comment.rb class Comment < ActiveRecord::Base belongs_to :article validates :name, :email, :body, :presence => true validate :article_should_be_published
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def article_should_be_published errors.add(:article_id, "is not published yet") if article && !article.published end end
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After reading this chapter, you should have a complete understanding of Active Record models. The chapter covered associations, conditions, validations, callbacks, and observers at breakneck speed. Now the fun part starts. In the next chapter, you get to use all the groundwork established in this chapter to produce the web interface for the data structures you ve created. This is when you get to reap the benefits of your hard work.
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Action Pack: Working with the View and the Controller
When you type a URL into your browser s address bar and press Enter, a few things happen behind the scenes. First, the URL is translated into a unique address by which the server that hosts the application can be identified. The request is then sent to that server, which begins a chain of events that culminates in a response. The response is usually, but not always, in the form of an HTML document, which is essentially a text document full of special codes that your browser understands and can render visually on your screen. At this point, the request cycle is complete, and the browser waits for further input from you. If you click a link somewhere on the page or type a new URL in the address bar, the cycle begins all over again: the request is sent, the server processes it, and the server sends back the response. When you make a request to a Rails application, this request cycle is the responsibility of a component of Rails called Action Pack. The Action Pack library is an integral component of the Rails framework and one that you need to be familiar with if you intend to master Rails. This chapter begins with an overview of Action Pack. Then, you get to work using it in your sample blog application.
NOTE If you need to get the code at the exact point where you finished 5, you can download the zip file from http://github.com/downloads/ccjr/blog/chapter06.zip and extract it in your computer.
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