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One of the most common tasks performed with ImageMagick is to change the file format and therefore the compression algorithm used to encode an image file. Imagine for a second that someone has just e-mailed a TIFF file for you to post online, and you want to make the file smaller and better supported by most browsers so you decide to convert it to a JPEG file. How do you perform that conversion You use ImageMagick s convert command, of course. Here s an example: convert input.png output.jpg This will perform the conversion for you. How you decide what file format to use can be a complex proposition, however, and this chapter will attempt to guide you through the various options that are available.

Listing 7-23 Updated Bookmark Class class Bookmark { def belongsTo = User User user .. } In addition, if a user is not logged in, you are going to have to redirect the user to a login screen to log in Before this, however, you need to consider what happens if the user goes directly to a URL that is secure This is where interception and interceptor conditions come in handy Firstly, let s create a new abstract base controller by running the grails create-controller command and using the name secure By making the controller abstract it will not be exposed to the outside world as a regular controller, thus allowing you to safely subclass the controller Next you need to modify the controller so that it defines the authenticating interceptor, as shown in Listing 7-24 Listing 7-24.

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Most modern Web sites are database driven, meaning the site content is stored in a relational database. This allows a clean separation of data and logic (in the same way views and templates allow the separation of logic and display). The next chapter covers the tools Django provides to interact with a database.

n 3, we covered the fundamentals of building dynamic Web sites with Django: setting up views and URLconfs. As we explained, a view is responsible for doing some arbitrary logic and then returning a response. In the example, our arbitrary logic was to calculate the current date and time. In modern Web applications, the arbitrary logic often involves interacting with a database. Behind the scenes, a database-driven Web site connects to a database server, retrieves some data out of it, and displays that data, nicely formatted, on a Web page. Or, similarly, the site could provide functionality that lets site visitors populate the database on their own. Many complex Web sites provide some combination of the two. Amazon.com, for instance, is a great example of a database-driven site. Each product page is essentially a query into Amazon s product database formatted as HTML, and when you post a customer review, it gets inserted into the database of reviews. Django is well suited for making database-driven Web sites, as it comes with easy yet powerful ways of performing database queries using Python. This chapter explains that functionality: Django s database layer.

Authenticating Controller 1 abstract class SecureController { 2 def beforeInterceptor = [ action: this&auth, 3 except: [ 'handleLogin', 'login', 4 'handleRegistration', 'register' ] 5 ] 6 7 private auth() { 8 if(!sessionuser) { 9 redirect(controller:'user',action: 'login') 10 return false 11 } 12 } 13 } Interestingly, the interceptor defined on lines 2 through 5 uses Groovy s map syntax to refer to a private auth method using Groovy s method closure syntax The method closure syntax allows you to reference any normal method as if it were a closure The map also defines a second argument called except which makes sure the interceptor is executed for all actions except the login, register, handleRegistration, and handleLogin actions As an alternative, you can use the only argument, which will apply the interceptor only to the specified actions.

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