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< xml version="1.0" encoding="UTF-8" > <exercises> <exercise> <exercise-type></exercise-type> <id type="integer">8</id> <name>Abdominals</name> <user-id type="integer">2</user-id> </exercise> <exercise> <exercise-type></exercise-type> <id type="integer">6</id> <name>Bench Press</name> <user-id type="integer">2</user-id> </exercise> <exercise> <exercise-type></exercise-type> <id type="integer">7</id> <name>Biceps Curl</name> <user-id type="integer">2</user-id> </exercise> <exercise> <exercise-type></exercise-type> <id type="integer">9</id> <name>Lat Pulldowns</name> <user-id type="integer">2</user-id> </exercise> <exercise> <exercise-type></exercise-type> <id type="integer">10</id> <name>Leg Press</name> <user-id type="integer">2</user-id> </exercise> </exercises> If you wanted to view the details of a specific exercise, you could simply specify it in the URL: curl -X GET --Basic -u ealameda:test -H "Accept: text/xml" http://localhost:3000/exercises/6

This loop, like the one in Listing 3-4, goes through all of the event types and adds them into an array, and then adds that array to the chart.

The three remaining type-checking methods test for arrays, hashes (instances of Prototype s Hash class), and DOM element nodes. Each of these would respond to typeof with object, but this is unacceptable for arrays and DOM nodes in particular, since they re among the most commonly used objects in the browser environment.

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< xml version="1.0" encoding="UTF-8" > <exercise> <exercise-type></exercise-type> <id type="integer">6</id> <name>Bench Press</name> <user-id type="integer">2</user-id> </exercise> To create a new goal, however, we ll need to specify that we want to use the HTTP verb POST instead and use the d parameter to set our post parameters: curl -X POST --Basic -u ealameda:test -d "goal[name]=Daily Calories" -d "goal[value]=1300" -H "Accept: text/xml" http://localhost:3000/goals Once we ve created the new goal, we can verify it s there by viewing the list of goals: curl -X GET --Basic -u ealameda:test -H "Accept: text/xml" http://localhost:3000/goals < xml version="1.0" encoding="UTF-8" > <goals> <goal> <id type="integer">3</id> <last type="decimal">250.0</last> <name>Weight Loss</name> <user-id type="integer">2</user-id> <value type="decimal">220.0</value> </goal> <goal> <id type="integer">4</id> <last type="decimal">110.0</last> <name>Blood Sugar (post lunch)</name> <user-id type="integer">2</user-id> <value type="decimal">100.0</value> </goal> <goal> <id type="integer">5</id> <last type="decimal"></last> <name>Daily Calories</name> <user-id type="integer">2</user-id> <value type="decimal">1300.0</value> </goal> </goals>

Summary

var amigos = ["Lucky", "Ned", "Dusty"]; typeof amigos; //-> 'object' Object.isArray(amigos); //-> true var villain = $('el_guapo'); typeof villain; //-> 'object' Object.isElement(villain); //-> true var partyFavors = $H({ cake: amigos: 1, 3,

In this chapter, you learned how you can create beautiful graphs in just a few lines of code with graphing libraries like Gruff and Scuffy. You saw how to use Active Record and Gruff to extract data from a database, and then create a graph from it with relatively simple code. The Transmegtech Studios examples demonstrated how to take business data, use Active Record to summarize the data into a useful form, and then use Gruff to present it. You created detailed reports on an entire staff of people in just 77 lines of code! So far, you ve learned how to perform calculations using Active Record and how to use Gruff to create attractive charts. However, these tasks are only part of a large project. Presenting the data to the users in a way they can use it is also important. The next chapter explains how you can let users view and manipulate data on their desktop.

JavaScript s weak typing is a boon to API developers, since it allows for functions that can take many different combinations of arguments. Consider Prototype s own $: it can accept any number of arguments, each of which can be either a string or an element. Let s look at the source code for $:

At this time of this writing, a number of users were complaining of having issues authenticating through RESTful authentication and were proposing a workaround of making the following modifications to the login required method in /lib/authenticated_system.rb. Advocates of the modification suggest changing it from this: def login_required username, passwd = get_auth_data self.current_user ||= User.authenticate(username, passwd) || :false if username && passwd logged_in && authorized true : access_denied end to this: def login_required username, passwd = get_auth_data if self.current_user == :false && username && passwd self.current_user = User.authenticate(username, passwd) || :false end logged_in && authorized true : access_denied end You can read more about it at http://www.railsweenie.com/forums/3/topics/1258 if you encounter similar issues.

function $(element) { if (arguments.length > 1) { for (var i = 0, elements = [], length = arguments.length; i < length; i++) elements.push($(arguments[i])); return elements; } if (Object.isString(element)) element = document.getElementById(element); return Element.extend(element); }

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