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In order to store the data from a model instance in a historical record that can be easily added, searched and retrieved, we need a new model behind the scenes. In theory, we could use any structure that can contain data; perhaps a single that contains pickled objects. But to search and browse the historical data more easily, it makes sense to use the same data structure as the original model itself. 3 showed that a model s attribute contains all the information about how that model was defined, including all of its fields in the order they were declared. This information is crucial, because it allows us to create a new model that matches that same data structure. The only trouble is that gets called on each field in turn, in the order they appear in the namespace dictionary Python created for the model s definition. Since standard dictionaries don t have a guaranteed order, there s no way to predict how many fields will already have been processed by the time gets a chance to peek at the model. To solve this, we turn to a signal: . Django fires this signal once all the fields and managers have been added to the model and everything is in place to be used by external code. That s when will have guaranteed access to all the fields, including the order in which they were defined, so continues by setting up a listener for .

The beauty of this sort of system is that no matter where you draw those lines, you won t be cutting off anyone now or in the future from receiving the content of your site Just like television Appendix C includes a version of the browser-grading chart that we think is appropriate for most general-use web sites and applications It may not work for your organization without some modifications, but it should at least provide you with a good start toward your own grading system..

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Django will now call with the fully-prepared model once everything is in place to continue processing it. That method is then responsible for performing all of the remaining tasks, all the way through Step 3. Most of the details are delegated to other methods, but coordinates them. The first thing needs to do is copy the original model to create a new model with extra fields attached. It defers this task to the method, which in turn relies on a few other methods.

To process the logout, a new public method called processLogout() needs to be added to the Admin class. This method does a quick check to make sure the proper action, user_logout, was supplied, and then uses session_destroy() to remove the user data array by destroying the current session entirely. You add this method to the Admin class by inserting the following bold code: < php class Admin extends DB_Connect { private $_saltLength = 7; public function __construct($db=NULL, $saltLength=NULL) {...} public function processLoginForm() {...} /** * Logs out the user * * @return mixed TRUE on success or messsage on failure */ public function processLogout() { /* * Fails if the proper action was not submitted */ if ( $_POST['action']!='user_logout' ) { return "Invalid action supplied for processLogout."; } /* * Removes the user array from the current session */ session_destroy(); return TRUE; } private function _getSaltedHash($string, $salt=NULL) {...} } >

Now that you understand the benefits of semantic markup, how can you go about creating (X)HTML that is as structured and meaningful as possible Start by using the right (X)HTML elements for your content. If it s a paragraph, put it in a <p> tag. If it s a header, put it in an <hx> tag. If it s a list of links, use <a> tags inside of list elements. This may sound simple, but it s astonishing how many sites you ll find on the Internet that don t bother with these details at all. They choose to put two <br> tags after some text rather than using the paragraph element, or they use <font size="5"> instead of a header element. To help you decide on the right elements for your content, become familiar with some of the lesser-used (X)HTML tags. There are a whole host of useful elements out there that many web developers seem to completely forget about. By simply adopting some of these tags as your own, you can quickly add structure, context, and styling hooks to your documents. We ll be using many of these tags later in the book as we get into styling various page elements. In the meantime, you may wish to brush up on your (X)HTML if these are not elements you are familiar with. Table 1-1 lists some of the lesser-used tags you may want to get to know. Table 1-1. Semantic (X)HTML Elements That Are Often Underused by Designers and Developers

There are a few different sub-steps required in creating a model like this. Adding all the logic in one method would hamper readability and maintainability, so it s been broken up into three additional methods.

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