Changing the Controller in Font

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Changing the Controller
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The following code implements the sorting. Change the app/controllers/admin/ book controller.rb file accordingly. def list @page_title = Listing books sort_by = params[:sort_by] @book_pages, @books = paginate :books, :order => sort_by, :per_page => 10 end Note the sort order is specified with the sort_by parameter. This parameter is passed to the paginate method, which has built-in support for ordering the paginated list.
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CHAPTER 3 BOOK INVENTORY MANAGEMENT
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We ll update our book administration DSL to include a method for testing the List Books user story. The new method performs a simple smoke test. It accesses the page and verifies that the server responds with an HTTP 200 status code, which means the request was successfully processed. Change the BookTestDSL as follows, adding the code shown in bold. module BookTestDSL attr_writer :name def list_books get "/admin/book/list" assert_response :success assert_template "admin/book/list" end def add_book(parameters) Also add the row highlighted below to the end of the test_book_administration test. This method simulates George browsing to the book list page, right after he has added a new book. def test_book_administration . . george.list_books end The finished page can be accessed at http://localhost:3000/admin/book/list and should look like Figure 3-9.
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Figure 3-9. Testing the List Books user story
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CHAPTER 3 BOOK INVENTORY MANAGEMENT
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Completing the View Book User Story
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The View Book user story also needs some cleaning up before George is happy. The code created by the scaffolding displays the values of all database columns directly to the user. This means, for example, that the publisher s ID is shown instead of the publisher s name. We ll fix this and also add code that displays the authors of the book and the book cover.
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Changing the View
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First, change app/views/admin/book/show.rhtml as follows: <dl> <dt>Title</dt> <dd><%= @book.title %></dd> <dt>Publisher</dt> <dd><%= @book.publisher.name %></dd> <dt>Published at</dt> <dd><%= @book.published_at.strftime("%m/%d/%Y at %I:%M%p") %></dd> <dt>Authors</dt> <dd><%= @book.authors.collect{|author| author.name }.join(', ') %></dd> <dt>ISBN</dt> <dd><%= @book.isbn %></dd> <dt>Blurb</dt> <dd><%= textilize @book.blurb %></dd> <dt>Price</dt> <dd><%= @book.price %></dd> <dt>Page count</dt> <dd><%= @book.page_count %></dd> <dt>Cover image</dt> <% if @book.cover_image.nil %> <dd>N/A</dd> <% else %> <dd><%= image_tag url_for_file_column(:book, :cover_image) %></dd> <% end %> </dl> <p><%= link_to "Edit", :action => "edit", :id => @book %> | <%= link_to "Back", :action => "list" %></p> Note that we use image_tag and the method url_for_file_column to display the uploaded image of the book cover, but only if it exists. We also format the field published_at to use a standard format. Recall that George wanted the Blurb field to be easy to edit. This is why we have used the Textile markup language in the Blurb field, instead of HTML. The Textile markup we entered in the Blurb field is passed through the textilize method in the view: <%= textilize @book.blurb %>
CHAPTER 3 BOOK INVENTORY MANAGEMENT
This translates the Textile markup in the Blurb field to HTML. You ll see this in action in the next section.
Note The textilize method is resource-intensive and should be executed only once (when the object
is saved). The resulting HTML should be stored in a database field, for example, blurb_html. The conversion can easily be done using a before_save filter in the Book model, and then changing the view to display the blurb_html column s value, instead of running the conversion for each request.
Changing the Controller
There s one more thing to fix. The view expects to find the instance variable page_title, which means you should change the controller s show action, as follows: def show @book = Book.find(params[:id]) @page_title = "#{@book.title}" end You can now access the book details page by clicking the Show link located next to a book on the books list page. Figure 3-10 shows the page after all the changes have been done. Note that the uploaded image is shown at the bottom of the page.
Figure 3-10. Testing the View Book user story
CHAPTER 3 BOOK INVENTORY MANAGEMENT
Another thing to note about Figure 3-10 is that the Blurb field shows a heading, a bulleted, and a numbered list. In Figure 3-10, we entered the following into the Blurb field: h1. This is a heading * Item 1 ## Item 1.1 * Step 2 ## Step 2.1
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