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Listing 5-28. Adding the published Method in app/models/article.rb: http://gist.github.com/326170 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 This gets you a step closer to your goal. When building validations, Active Record gives you nice objects called errors to use. Whenever you want to add a validation error to the list of errors, you just say errors.add(column_name, error_message). So, let s implement a method called article_should_be_published in the Comment class that uses this functionality, as shown in Listing 5-29. Listing 5-29. Adding the article_should_be_published Method in app/models/comment.rb: http://gist.github.com/326177 class Comment < ActiveRecord::Base belongs_to :article def article_should_be_published errors.add(:article_id, "is not published yet") if article && !article.published end end This checks whether you should apply the error by evaluating the if statement. If that if statement is true, you want to add an error into the errors object. Note that before you test whether the article is published, you make sure article isn t nil. This is so your test doesn t throw an error. If article is nil, that should be handled by another validator: the validates method with the :presence option. How do you tell Active Record that this method should be run before a save You use the validate class method and pass it a symbol with the name of the method. At the top of your Comment class, add the code shown in Listing 5-30. Note that we also expect comments to have values for name, email and body; so, we add a presence validation call.

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C ha P ter 13 W eB a PP LI C a t I O N F r a M e W O r K S : r a I LS , S I N a t r a , a N D r a M a Z e

We re almost finished with our work in this chapter. Only a few tasks remain. We need to spruce up our templates a bit and make them a little cleaner. We also need to make it possible for event owners to edit and delete their events. Finally, we want to update the layout and apply some CSS styles to make things look pretty. Ready Let s get started!

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If you totally shut down your web browser, reload it, and do the same again, you ll notice the number has gone back to 1. This is because, by default, sessions are only stored until the web browser is closed. You can override this if you want to, though, with some settings placed in config/initializers/session_store.rb (or config/environment.rb with Rails 2.2 and earlier). You can learn more at http://errtheblog.com/posts/22-sessions-n-such.

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Listing 5-30. validate Method in app/models/comment.rb: http://gist.github.com/326183 class Comment < ActiveRecord::Base belongs_to :article validates :name, :email, :body, :presence => true validate :article_should_be_published def article_should_be_published errors.add(:article_id, "is not published yet") if article && !article.published end end This lets Active Record know to pay attention to your new article_should_be_published method. In 10, you write tests to make sure this is working. But you can also go to the console if you have it open already, don t forget to reload! and try to create an invalid object to see if it reports errors for you. The easiest way to get to errors in an Active Record object is with comment.errors.full_messages, as shown here: >> article = Article.draft.first => #<Article id: 7, title: "One-to-many associations", > >> comment = article.comments.create :name => 'Dude', :email => 'dude@example.com', :body => 'Great article!' => #<Comment id: nil, article_id: 7, name: "Dude", email: "dude@example.com", body: "Great article!", created_at: nil, updated_at: nil> >> comment.errors.full_messages => ["Article is not published yet"]

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