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n this chapter, we ll work through setting up the basic functionality of a book catalog from the customer s perspective. We ll build the chapter around four user stories where Jill, George s book-hogging customer, plays the starring role. For the Emporium book catalog, we will create a simple catalog page for the books, along with pages that display details for individual titles. The interface also will need a way to search for books by their titles and descriptions. We will use Ferret, a full-text search engine written in Ruby, to supply this functionality. Additionally, we will create a latest books page and RSS feed, so that Jill can follow what s new at Emporium.
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Getting the Book Catalog Requirements
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If there s one person keeping Emporium going, that s Jill. Jill lives just a couple of blocks away from the store. When she rushes through the door with her plasma-TV-sized goggles, George knows that the day is saved. However, Jill s health is not as it used to be. Her visits have gotten fewer and fewer lately. She would love to support George and buy a lot of new books, but it s just too much effort for her to come over daily. Jill is a smart lady, though, and she s found out that this new thing called the Internet can work as an intermediary between her and her beloved book supply.
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CHAPTER 4 BOOK CATALOG BROWSING
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To make Jill a happy online customer, George comes up with four user stories for this sprint: Browse books: Jill needs a way to browse the books in the shop. We will keep the list really simple at this point, just letting her shuffle through the supply and find out about new titles. View book details: After browsing through titles in the first story or getting a list of matching titles in the second one, Jill needs a way to get specific information about a particular title. As a former librarian, she is obsessed about knowing even the most mundane details of every book she is thinking about buying. Search books: Sometimes Jill finds out about an interesting topic and wants to know more about the subject. She needs to be able to write a few keywords and get a list of all the titles that match her search. Get latest books: As a book addict, Jill needs a way to keep current about all new books. She would like to find out about new titles with a single look on the Emporium site. What would make her really happy, however, would be an RSS feed that she could follow on her shiny white iBook without even visiting the website. That would leave her more time for her real pleasure, perusing her precious tomes. We will tackle these user stories in this chapter, one by one, using the already familiar TDD method.
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Implementing the Book Catalog Interface
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To be able to really test browsing a list of titles, we need to have a number of books available for viewing. Therefore, we need to expand our authors.yml, publishers.yml, books.yml, and authors_books.yml fixture files in test/fixtures. You can download the files from the Source Code/Downloads section of www.apress.com. As in the previous chapter, we ll use integration tests for this sprint, because they work well to exercise the book catalog browsing system from end to end. First, we ll create a test stub by using the Rails test generator: $ script/generate integration_test BrowsingAndSearching exists test/integration/ create test/integration/browsing_and_searching_test.rb Again, we ll delete the test_truth from the test file and replace it with our real test, as shown in Listing 4-1.
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CHAPTER 4 BOOK CATALOG BROWSING
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Listing 4-1. First Version of the Integration Test for the Book Catalog Interface require "#{File.dirname(__FILE__)}/../test_helper" class BrowsingAndSearchingTest < ActionController::IntegrationTest fixtures :publishers, :authors, :books, :authors_books def test_browsing_the_site jill = enter_site(:jill) jill.browse_index end private module BrowsingTestDSL attr_writer :name def browse_index get "/catalog" assert_response :success assert_template "catalog/index" assert_tag :tag => "dl", :attributes => { :id => "books" }, :children => { :count => 10, :only => {:tag => "dt"}} assert_tag :tag => "dt", :content => "The Idiot" end end def enter_site(name) open_session do |session| session.extend(BrowsingTestDSL) session.name = name yield session if block_given end end end
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