c# .net barcode generator free BOOK CATALOG BROWSING in Font

Drawing Universal Product Code version A in Font BOOK CATALOG BROWSING

CHAPTER 4 BOOK CATALOG BROWSING
GS1 - 12 Generator In None
Using Barcode creator for Font Control to generate, create UPC-A Supplement 5 image in Font applications.
www.OnBarcode.com
Barcode Generator In None
Using Barcode creation for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
In the test case, we create a DSL module, as in the previous chapter. We first test that requesting "/catalog" works and that we get the default index template rendered. Then we check that there is a list of books (laid out with an HTML definition list) on the page and that a book called The Idiot exists in that list. Our test fails magnificently, in plain old TDD way, so it s time to implement the functionality. First, we need to create the controller for the catalog. We ll name it catalog so that it will match the URL requested in the browse_site test method. Once again, use the familiar script/generate command and give the needed action names (for all our projected user stories) as parameters. $ script/generate controller Catalog index show search latest exists exists create exists create create create create create create create app/controllers/ app/helpers/ app/views/catalog test/functional/ app/controllers/catalog_controller.rb test/functional/catalog_controller_test.rb app/helpers/catalog_helper.rb app/views/catalog/index.rhtml app/views/catalog/show.rhtml app/views/catalog/search.rhtml app/views/catalog/latest.rhtml
ECC200 Creation In None
Using Barcode maker for Font Control to generate, create Data Matrix ECC200 image in Font applications.
www.OnBarcode.com
Making Barcode In None
Using Barcode drawer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Implementing the Browse Books User Story
Print EAN 128 In None
Using Barcode generation for Font Control to generate, create GTIN - 128 image in Font applications.
www.OnBarcode.com
QR-Code Generation In None
Using Barcode maker for Font Control to generate, create Quick Response Code image in Font applications.
www.OnBarcode.com
Now that we have the controller in place, we re ready to begin with the Browse Books user story.
Paint EAN-13 In None
Using Barcode maker for Font Control to generate, create UPC - 13 image in Font applications.
www.OnBarcode.com
Making USD8 In None
Using Barcode encoder for Font Control to generate, create Code 11 image in Font applications.
www.OnBarcode.com
Modifying the Controller
Making UPC Code In Java
Using Barcode drawer for Java Control to generate, create UPC-A image in Java applications.
www.OnBarcode.com
UCC - 12 Recognizer In .NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
At this point, we re interested in only the index action and the corresponding view. Open app/controllers/catalog_controller.rb, which was just created by the generator command. Modify the index method so that it looks as follows: def index @page_title = "Book List" @book_pages, @books = paginate :books, :per_page => 10, :include => [:authors, :publisher], :order => "books.id desc" end
Barcode Encoder In .NET
Using Barcode generation for Reporting Service Control to generate, create Barcode image in Reporting Service applications.
www.OnBarcode.com
Paint GS1 - 13 In Objective-C
Using Barcode creator for iPad Control to generate, create EAN-13 image in iPad applications.
www.OnBarcode.com
CHAPTER 4 BOOK CATALOG BROWSING
Paint GS1 - 12 In C#
Using Barcode generator for .NET framework Control to generate, create UCC - 12 image in .NET framework applications.
www.OnBarcode.com
Barcode Maker In .NET Framework
Using Barcode printer for Reporting Service Control to generate, create Barcode image in Reporting Service applications.
www.OnBarcode.com
In the index action, we first set the page title so that the layout file will pick it up and show it in the headers of the resulting page. Additionally, the action contains a normal pagination call, just as in 3. However, this time, we use the include parameter for the paginate call. The include parameter is used in the ActiveRecord find method (which is used internally by paginate) to make ActiveRecord build up a join query. This single SQL query will be used not only to find the books, but also to fetch the associated authors and publishers from the database. If we omitted the parameter, our code would end up calling a new SQL query each time we needed to get the author or publisher details for a given book. In our case, it would result in 2n+1 (where n is the number of books) queries instead of just one. When the site gets more traffic, that could become a huge performance bottleneck.
Barcode Maker In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Note We can hear you ask, Where does the 2n+1 come from The first query is the one where all the books are fetched. Then, when we iterate over all the n books and call their authors and publisher methods, each call will result in an additional SQL query, resulting in two additional queries for each book. The resulting amount of queries is thus 2 queries n books + the original query, or 2n+1.
Barcode Generator In None
Using Barcode creator for Office Excel Control to generate, create Barcode image in Office Excel applications.
www.OnBarcode.com
Barcode Generation In Java
Using Barcode generator for BIRT reports Control to generate, create Barcode image in BIRT reports applications.
www.OnBarcode.com
Modifying the View
GS1 128 Maker In .NET Framework
Using Barcode drawer for Reporting Service Control to generate, create GTIN - 128 image in Reporting Service applications.
www.OnBarcode.com
UCC - 12 Drawer In Java
Using Barcode encoder for Android Control to generate, create UPC-A image in Android applications.
www.OnBarcode.com
Next, open app/views/catalog/index.rhtml and replace its contents with the following code. <dl id="books"> <% for book in @books %> <dt><%= book.title %></dt> <% for author in book.authors %> <dd><%= author.last_name %>, <%= author.first_name %></dd> <% end %> <dd><%= pluralize(book.page_count, "page") %></dd> <dd>Price: $<%= sprintf("%.2f", book.price) %></dd> <dd><small>Publisher: <%= book.publisher.name %></small></dd> <% end %> </dl>
<%= link_to 'Previous page', { :page => @book_pages.current.previous } if @book_pages.current.previous %> <%= link_to 'Next page', { :page => @book_pages.current.next } if @book_pages.current.next %> In the view, we iterate over all the books we got from the controller and show their titles, authors, prices, page counts, and publishers. The pluralize helper will show the word page in either singular or plural, depending on the value of book.page_count. In the end, we show links to next and/or previous page in case there are more than ten books in the @books array.
CHAPTER 4 BOOK CATALOG BROWSING
Running the Integration Test
Now that we have our simple browsing functionality implemented, we can run our test case. $ ruby test/integration/browsing_and_searching_test.rb Loaded suite test/integration/browsing_and_searching_test Started . Finished in 0.514885 seconds. 1 tests, 4 assertions, 0 failures, 0 errors The test passes, but browsing is really not browsing if it involves only a single page. So, let s create another test case that checks that the pagination in our catalog works as expected. Make the following changes to test/integration/browsing_and_searching_test.rb: 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 jill.go_to_second_page 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
Copyright © OnBarcode.com . All rights reserved.