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CHAPTER 5 ADVANCED ACTIVE RECORD: ENHANCING YOUR MODELS
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authenticated : This is a simple predicate method that checks to make sure the stored hashed_password matches the given password after it has been encrypted (via encrypt). If it matches, true is returned. Let s play with these new methods from the console so you can get a better idea of how this comes together.
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>> => >> => User.authenticate("eugene", "secret") #<User:0xb74197d8> User.authenticate("eugene", "secret2") nil
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So, when we ask the User model to authenticate someone, we pass in the login and the plain-text password. The authenticate method hashes the given password and then compares it to the stored (hashed) password in the database. If the passwords match, the User object is returned and authentication was successful. When we try to use an incorrect password, nil is returned. In 6, we ll write code in our controller to use these model methods and actually allow users to log in to the site. But for now, we have a properly built and secure back end for how users will authenticate.
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After reading this chapter, you should have a complete understanding of Active Record models. We ve covered associations, conditions, validations, and callbacks at breakneck speed. Now the fun part starts. In the next chapter you will get to use all the groundwork that we established in this chapter to produce the web interface for the data structures we have created here. This is when you really get to reap the benefits of your hard work.
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Action Pack: Working with the View and the Controller
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hen you type a URL into your browser s address bar and click enter, a few things happen behind the scenes. First, the URL is translated into a unique address by which the server that hosts the application can be identified. The request is then sent to that server, which begins a chain of events that culminates in a response. The response is usually, but not always, in the form of an HTML document, which is essentially a text document full of special codes that your browser understands and can render visually on your screen. At this point, the request cycle is complete, and the browser waits for further input from you. If you click a link somewhere on the page, or type a new URL in the address bar, the cycle begins all over again: the request is sent, the server processes it, and the server sends back the response. When you make a request to a Rails application, this request cycle is the responsibility of a component of Rails called Action Pack. The Action Pack library is an integral component of the Rails framework and one that you ll need to get quite familiar with if you intend to master Rails. In this chapter, we ll begin with an overview of Action Pack, and then get to work using it in our sample events application.
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We already discussed the MVC pattern, but in case you need a refresher, here it is. The model is your application s world, most often represented by database objects, like articles, comments, or subscribers. The controller is the grand orchestrator, dealing with requests and issuing responses. The view is the code that contains instructions for rendering visual output for a browser, like HTML. Armed with this refresher, you might be able to guess what roles are played by the Action Pack. Since this isn t a test, we ll give away the answer: Action Pack is the controller and the view. The controller performs the logic, and the view renders the template that is
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
given back to the requesting browser. Not surprisingly, the two modules that make up Action Pack are named accordingly: Action Controller and Action View. At this point, you might be wondering why the view and the controller are wrapped up in a single library, unlike models, which have a library of their own. The answer is subtle and succinct: controllers and views are very closely related. In the pages that follow, we ll paint a more complete picture of both the role and the relationship of controllers and views, how they work, and how they work together to create and control the interface of a Rails application.
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