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As you can see, you get an implicit PDF::Writer object, pdf, and the results of your PDF view are automatically sent to the user s browser. You can get the full details on PDF::Writer at its home page: http://ruby-pdf. rubyforge.org/pdf-writer/. Now that you have an idea of what ActiveRecord::Extensions and PDF::Writer can do, let s take a look at how to use them.

But when it s asked to do more complex checks, it falls flat on its face:

<%= error_messages_for :goal %> <% form_for(:goal, :url => goal_path(@goal), :html => { :method => :put }) do |f| %> <%= render :partial => 'form', :locals => {:f => f} %> <% end %> <%= link_to 'Show', goal_path(@goal) %> | <%= link_to 'Back', goals_path %> We ll alter /app/view/goals/new.rhtml in a similar fashion: <h1>New goal</h1> <%= error_messages_for :goal %> <% form_for(:goal, :url => goals_path) do |f| %> <%= render :partial => 'form', :locals => {:f => f} %> <% end %> <%= link_to 'Back', goals_path %> Once again, we ll extract out the iteration of our goals from the index page to a partial named _goal.rhtml that we ll use to render the collection. So create a file named _goal.rhtml in /app/views/goals with the following content in it: <tr> <td><%=h goal.name %></td> <td> </td> <td> <%= link_to image_tag("display.gif", {:title => "View Report"}), goal_path(goal) %> </td> <td> <%=link_to image_tag("edit_photo.gif", {:title => "Edit Goal Details"}), edit_goal_path(goal) %> </td> <td> <%= link_to image_tag("delete_photo.gif", {:title => "Delete Goal"}), goal_path(goal), :confirm => 'Are you sure ', :method => :delete %> </td> </tr>

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Suppose you operate an online store that sells digital books in PDF format. The books are marketed through a variety of online advertising sources. Each source referral comes at a certain cost per click, and each source provides a different amount of traffic each month. Additionally, each source provides a different response rate, since visitors from sites whose topic is closely linked to the e-books being sold are more likely to buy an e-book, as are visitors from sites whose median income is higher. As a result, it s difficult to analyze the sales from the different sources. You would like to use Ruby to analyze your web logs and determine exactly how many sales are being derived from each source, as well as exactly how much each sale costs. If the average sale cost from an advertiser is more than the value of each sale, then the advertiser should be dropped. On the other hand, spending should be increased on an advertiser whose cost per sale is particularly low. You want to create a report that has nice, attractive graphs with this data, and you want to be able to easily update the reports

typeof [1, 2, 98]; //-> 'object' typeof new Date(); //-> 'object' typeof new Error('OMG'); //-> 'object' Arrays, Dates, and Errors are objects, of course, but so are all non-primitives. Imagine if you asked me, Do you know what time it is and I responded only with Yes. My answer is both narrowly correct and completely useless. The one other value returned by typeof is function, but that applies both to functions and regular expressions: typeof $; //-> 'function' typeof /ba( :r|z)/; //-> 'function'

Suppose the management at Transmegtech Studios wants you to create a single chart containing the average build time for each event for all players. You can do that with a line chart. Listing 3-5 shows the code to create a single chart summarizing all of the players.

In other words, typeof arbitrarily singles out functions, even though they re instances of Object just like Array, Date, and Error types. And the fact that RegExp is a function (if we re being technical about it) just makes it harder to distinguish them from true functions what a useless taxonomy. Prototype includes the type checking that the language left out. In a dynamic, browser-based scripting environment, some checks happen again and again. Prototype defines a handful of methods that test for certain data types: they all accept one argument and return either true or false.

Finally, we ll edit the index page (/app/views/goals/index.rhtml) to utilize our two new partials: <h1>Listing goals</h1> <table> <tr><th>Name</th></tr> <%= render :partial => 'goal', :collection => @goals %> </table> <br /> <h1>Add a New Goal</h1> <div id="add_goal"> <% form_for(:goal, :url => goals_path, :html => {:id => 'new_goal'}) do |f| %> <%= render :partial => 'form', :locals => {:f => f} %> <% end %> </div>

Listing 3-5. Creating a Line Chart for All Player Events (all_players.rb)

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