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 content with Ruby on Rails. This e-book is for an individual who has simple innovations of object-oriented programming in addition to relational databases and needs to improve on-line purposes utilizing Ruby on Rails. previous wisdom of Ruby or Rails isn't anticipated.

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It automatically calls the initialize method. ") Once you create the instance of a class, you can call its methods. tell("first") Similarly, attributes can be get and set by calling getters and setters on the object of the Tale class. author= "Jim Henson" And to get the name of the author you can call the getter on the object. The # sign is used to replace the value of the variable that comes after it. author will be replaced by its value as it comes after #. author" Inheritance In general, inheritance is something that is transferred from parents to children.

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.

Thus, by understanding how Ruby works, you can know about the building blocks of RoR. That in turn, will help you to have a clearer picture of how the different components of RoR fit into the bigger picture. The chapter will first introduce you to the basic concepts of Ruby. Then it will move on to the basic concepts and components of RoR. Finally, the chapter will be completed with an example of RoR, which can be considered as 'Hello World' in RoR. Ruby—the Basics To understand Ruby, you will have to understand the concepts that are fundamental to Ruby.

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