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user, params ) ] } } Notice that the redirect we defined in Listing 7-24 redirected to a controller called user, which doesn t at this point exist Remember that within a redirect you use the short name for the controller that has the first letter in lowercase and excludes the Controller suffix In this case the controller redirected to is called UserController, which will handle various aspects having to do with users in the bookmarks application, including the crucial aspect of being logged in What you need to do first is create this controller via the grails create-controller target By now the usage of the Grails targets should be fairly familiar, with the resulting class looking something like Listing 7-26 Listing 7-26.

Before we delve into any more code, let s take a moment to consider the overall design of a database-driven Django Web application. As we mentioned in previous chapters, Django is designed to encourage loose coupling and strict separation between pieces of an application. If you follow this philosophy, it s easy to make changes to a particular piece of the application without affecting the other pieces. In view functions, for instance, we discussed the importance of separating the business logic from the presentation logic by using a template system. With the database layer, we re applying that same philosophy to data access logic. Those three pieces together data access logic, business logic, and presentation logic comprise a concept that s sometimes called the Model-View-Controller (MVC) pattern of

Note You ll find out more about JPEG quality and what it actually means a little later in this section. For

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software architecture. In this pattern, Model refers to the data access layer, View refers to the part of the system that selects what to display and how to display it, and Controller refers to the part of the system that decides which view to use, depending on user input, accessing the model as needed.

The UserController class UserController { def index = {} } Of course, in order for users to log in, they re going to need an interface to enter their login details in the form of a login view This will be your first exposure to developing a GSP, which we ll be looking into in greater depth in 8 For the purposes of this example you need to create a new GSP view called logingsp in the grails-app/views/user directory that was conveniently created for you by Grails when the create-controller target was executed earlier Once created, populate the contents of the file as per the code in Listing 7-27..

The goal of explicitly defining patterns such as MVC is mostly to streamline communication among developers. Instead of having to tell your coworkers, Let s make an abstraction of the data access, then let s have a separate layer that handles data display, and let s put a layer in the middle that regulates this, you can take advantage of a shared vocabulary and say, Let s use the MVC pattern here.

now, just bear in mind that a quality of 50 percent is a quite poor quality image; image quality has been sacrificed for small image size.

Listing 7-27. The login.gsp File <html> <head> <title>Login Page</title> <meta name="layout" content="main" /> <style type="text/css" media="screen"> form { width: 300px; } input { position: absolute; left: 130px; } p { margin-left: 30px; } .button { margin-top: 30px; } </style> </head> <body> <div class="message">${flash.message}</div> <p> Welcome to Your Bookmarks. Login below or <g:link action="register">register here</g:link>. </p> <form action="handleLogin"> <p> <label for="login">Login:</label> <input type="text" name="login" /> </p> <p> <label for="password">Password:</label> <input type="password" name="password" /> </p> <input type="submit" value="Login" /> </form> </body> </html> Notice that there is a meta tag within the head tag that makes sure the main layout, located at grails-app/views/layouts/main.gsp, is used. This ensures that the login screen pulls in the Grails logo and look and feel, thus ensuring that the login screen doesn t look conspicuously like a dog s breakfast. I ll be covering layouts in greater detail in the next chapter on Groovy Server Pages, but feel free to work on the look and feel as much as you feel necessary. The screenshot in Figure 7-6 is what the login screen will end up looking like based on the code in Listing 7-27.

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