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One aspect of authentication that might not seem obvious is that all users must, for all intents and purposes, still be represented in Django as objects in the application. This isn t strictly required by Django as a framework, but most applications including the provided admin interface expect users to exist in the database, and will make relationships with that model. For backends that call out to external services for authentication, this means duplicating every user in Django s database to make sure applications work correctly. On the surface, this sounds like a maintenance nightmare; not only does every existing user need to be copied, but new users need to be added, and changes to user information should also be reflected in Django. If all this had to be managed by hand for all users, it would certainly be a considerable problem. Remember, though, that the only real requirement for an authentication backend is that it receives the user s credentials and returns a object. In between, it s all just standard Python, and the whole of Django s model API is up for grabs. Once a user has been authenticated behind the scenes, the backend can simply create a new if one doesn t already exist. If one does exist, it can even update the existing record with any new information that s updated in the real user database. This way, everything can stay in sync without having to do anything special for Django. Just administer your users using whatever system you re already using, and let your authentication backend handle the rest.

Sans Serif (font-family: sans-serif;)

Web applications typically spend most of their time dealing with information in databases, but there are a number of reasons an application may need to work directly with files as well. Whether it be users uploading avatars or presentations, generating images or other static content on the fly, or even backing up log files on a regular basis, files can become a very important part of an application. As with many other things, Django provides both a single interface for working with files and an API for additional backends to provide additional functionality.

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In some cases, it may be desirable to add a function directly to the jQuery object, which means you would be able to call it like so: $.yourFunction(); Adding functions to jQuery can help you keep your scripts organized and ensure that your function calls follow a consistent format. However, it s important to note that adding a function to jQuery does not allow you to chain it with a set of selected DOM elements; for this, you must use a method, which you ll learn how to do in this chapter.

Characters in a sans serif font have a proportional width and do not have serifs. Examples of sans serif fonts include Helvetica, Verdana, Arial, and Univers. In classical typography, sans serif fonts were sometimes classified as grotesque. This reflects the fact that they were once seen as unsightly and not practical for setting long bodies of text. In the past hundred years or so, this attitude has changed, and sans serif type is a lot more common on the Web than serif (no doubt due in part to the relic usability rule stated earlier). Even as sans serif has become more acceptable for body text, it is still used most often for headers and subheads. Figure 9-2 shows an example of a sans serif typeface.

Regardless of source, destination or purpose, all files in Django are represented as instances of . This works very much like Python s own file object, but with a few additions and modifications for use on the Web and with large files. Subclasses of can alter what goes on behind the scenes, but the following API is standard for all file types. The following attributes are available on all objects:

In your first extending jQuery example, you will add the date validation function you wrote in the last chapter to the jQuery object. Specifically, you ll leverage valid-date.js.

Monospace (font-family: monospace;)

A Boolean indicating whether the file has been closed. When instantiobjects are open, and its contents can be accessed immediately. The method sets this to , and the file must be reopened using before its contents can be accessed again. ated, all Typically an attribute of the file s class rather than an instance of it, this determines what size chunks should be used with the method. The access mode the file was opened with; defaults to opened. .

One thing you should consider is allowing custom aliases in your jQuery plugins. While this isn t strictly necessary, it is strongly encouraged because it can help you keep your plugin from breaking if the $ shortcut is given up by jQuery.noConflict(). Better still, this feature is so simple to implement that it s actually a little silly not to include it. When building a new plugin, you should put the plugin code within a function that is executed immediately when the script is loaded. At its outset, the script should look like this:

Characters in a monospace font are not proportional. Instead, each character has a uniform width. Monospace type may or may not have serifs. Examples of monospace fonts include Courier and Monaco. Monospace type is generally used to indicate typed text, such as code. It may also be used to emulate older technology, such as typewriters or early computer screens. Figure 9-3 shows a monospaced font.

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