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<h3>Record New Result for this Goal</h3> <% form_for(:result, :url => results_path(@goal)) do |f| %> <%= render :partial => 'results/form', :locals => {:f => f} %> <% end %> <%= link_to 'Back', workouts_path %>

function amigos(first, second, third) { alert(typeof third); } amigos("Lucky", "Ned", "Dusty"); // alerts "string" amigos("Lucky", "Ned"); // alerts "undefined"

Save this script as all_players.rb. You can run the script as follows:

When we defined our goals resource, we included that we wanted it to break normalization by storing the duplicate data of the most recent result, but we haven t built a way to capture that data yet. Thanks to Rails s powerful callback support this is an easy problem to solve, as we can simply add an after_create callback in our results model to magically populate the last attribute for the associated goal. Open /app/models/results.rb, and add our functionality like this: class Result < ActiveRecord::Base belongs_to :goal validates_presence_of :date, :value after_create :update_last_result def update_last_result goal.last = value goal.save end end Now, whenever we create a new result, its value will also be populated into the goals last field incredibly powerful yet seriously easy.

JavaScript treats these two properties differently just to screw with our heads:

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The output from the script is shown in Figure 3-5. This example packs a lot of information into the chart for demonstration purposes. You can design your own charts to contain less information and be easier to read.

typeof undefined; // "undefined" typeof null; // "object"

Most of the code in Listing 3-5 is identical to that in Listing 3-4; however, a few lines are different. For example, the object is a member of the Gruff::Line class, instead of the Gruff::Bar class:

With that last change, our application is well on its way. We can easily use the HTML interface to create and manage our workouts and goals, but what if we wanted to play around with the XML interface that we gained for free with REST The easiest way to do that is to simply append a .xml to the end of any the URL strings in our browser, and Rails will serve us back the XML version of any of any of our resources. You can see the result of pulling back the list of activities in a specific workout at http://localhost:3000/workouts/ 7/activities.xml in Figure 6-8, but some other example URLs are http://localhost:3000/exercises.xml http://localhost:3000/exercises/6.xml http://localhost:3000/goals.xml http://localhost:3000/goals/3/results/1.xml

Huh Why is null an object Do you mean for us to scream Fortunately, you can test for null by using a strict equivalence check (using three equals signs, rather than two). For example, consider Element#readAttribute, which returns null if the specified attribute does not exist:

line_chart = Gruff::Line.new(1024)

if ($('lastname').readAttribute('required') === null) alert("Last name not required.");

The limitation of using a web browser to experiment with your RESTful interface is that you re limited to mainly GET requests, so you can look but can t modify. Another alternative for interacting with your application that will allow you full access to read and modify your data is to use the command line utility curl. Some common curl options that you should know are -X [ ]: Specifies the HTTP verb (i.e., GET, POST, PUT or DELETE) -d [ ]: Sets POST variables -H [ ]: Sets the content type -U [ ]: Sets the username:password for HTTP authentication Using curl, you could access a list of all the exercises for a user ealameda (obviously, you ll need to use the username and password from the account that you created earlier) with the following command: curl -X GET --Basic -u ealameda:test -H "Accept: text/xml" http://localhost:3000/exercises

The parameter to the call to new is the horizontal size. You can also pass a string containing a full size parameter, such as 1024x768. One of the noteworthy changes is inside the main loop, which iterates through all of the players. Instead of writing each chart to a different file, the data is aggregated into a single chart, as follows:

On the other hand, the canonical way to check for undefined is to use typeof. We cannot allow that, however. Instead, we ll use Object.isUndefined:

data = [] Event.find_by_sql(sql).each do |row| data << (row.average_time.to_i/1000) end line_chart.data(player.nickname, data)

function amigos(first, second, third) { alert(Object.isUndefined(third)); }

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