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The first step is to tell Django how to manage the raw data in the database, using a standard field. Since pickled objects are just strings, some form of text field would clearly be prudent, and since there s no way to know in advance how large the pickled representation will be, the nearly limitless seems like an obvious choice. Of course, given that there will be some extra work going on for this new field, alone won t suffice. Instead, we ll create a subclass that inherits the database functionality of , while allowing extra customizations where necessary. Since fields are just Python classes like any other, this works just like you d expect, but with one addition. In order to interact with the database using a different value than is used to interact with other Python code, the attribute needs to be different than the attribute. This is controlled by a custom method.

In this chapter, you tackled using regular expressions for form validation. The concepts you learned can be applied to validating any type of data, and they will greatly aid you in making sure the information supplied in forms is usable by your applications. In the next chapter, you ll learn how to extend the jQuery object, both by directly extending the jQuery core and by developing a custom plugin for jQuery.

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Serif is often used in print and other media for body text extended passages of paragraphs and the like and is less commonly used for headers and subheads An archaic usability principle states that serif fonts should not be used on the Web The rationale that led to this belief was that computer screens are relatively low resolution and they don t have the capacity to display complex characters, such as those including serifs, with the detail they need This may have been true at one time, but today, computer display resolutions have increased (but are still much lower than the typical printed page), and most operating systems now offer built-in antialiasing, a process in which the edges are blurred slightly to mask the inherent pixel grid of the screen This has led to much better on-screen type rendering and a resurgence of serif type on the Web.

This much alone will suffice for getting the field set up properly for the database. At this point, it s even possible to assign a instance to a model and sync it with the database, and the column created will be perfectly usable for the duration of this example. Of course, it only manages the raw data so far; it won t be able to handle real Python objects at all, much less deal with pickling and unpickling as necessary.

jQuery s easy-to-use syntax led developers to begin writing scripts to achieve custom effects and other tasks. To make these scripts configurable and reusable, these developers constructed these scripts as plugins, or scripts that extend jQuery by adding new methods to the library. In this chapter, you ll learn how to add your own plugins to jQuery.

Figure 9-1 shows an example of a serif typeface..

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