Building Dynamic Web 2.0 Websites with Ruby on Rails: Create by A P Rajshekhar

By A P Rajshekhar

Learn how to create dynamic web pages with Ruby on Rails. This publication is for somebody who has uncomplicated techniques of object-oriented programming in addition to relational databases and desires to increase on-line functions utilizing Ruby on Rails. earlier wisdom of Ruby or Rails isn't anticipated.

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Data Validation: Validating the data before persisting it to the database is the first step in ensuring security of your website. To make it easier, Active Record provides validation of the Model component, also known as the Data Model. Data can be validated automatically when saved. You can also ensure that data is validated after an object is created or values are updated by using validate_on_create() and validate_on_update() methods. All the validation methods need to be overridden. [ 41 ] Getting to Know Ruby and RoR To create a model object from a table, you have to give the following command at the prompt of your application's directory: ruby script/generate model For example, to create model from a table named Tale, you have to issue the following command at the prompt: c:\InstantRails\rail_apps\test_app\> ruby script/generate model Tale Action View View component encompasses the logic for the presentation of the data present in the Model component.

Then it calls the tell method of Tale (which is FantasyTale's super class) to display part of the tale. tell ("Once") Ruby supports multiple inheritance through mixins. However, it is out of the scope of this chapter to discuss mixins. Modules Modules are the collection of classes or methods. The main use of modules is to prevent namespace clashes that may occur when you try to use different classes with the same name. Modules are defined by the module and end keywords. For example, Tale and FantasyTale classes can be encapsulated in a module as follows: module Tales class Tale end class FantasyTale < Tale end end To call a module, you will need to use the :: operator.

One of the commonly used Helpers is the Form Helper. It provides methods to create form elements such as checkboxes and textboxes. While using Form Helpers, you should start placing the element methods in the form of form_tag(). • Formatting Helper: Formatting of the data to be presented is one of the major concerns in the presentation logic. Using Formatting Helpers you can easily format the data in the way you require it. It contains Helpers for the formatting of date, currency, and string. • Layout: Layout defines how the various contents of a page are arranged.

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