Ruby on Rails Primer

May 17, 20131 like1,854 views

Rails is a web application framework written in Ruby that makes programming web apps easier by making assumptions to get developers started quickly. It utilizes conventions like DRY, MVC, and RESTful design. MVC separates business logic from presentation logic into models, views, and controllers. Controllers receive requests, interact with models to retrieve data, and render views to generate responses. Developers can also use Ruby gems to add additional functionality like user authentication, file uploads, and payment processing to their Rails applications.

What is Rails?
Rails is a web application development framework
written in the Ruby language. It is designed to
make programming web applications easier by
making assumptions about what every developer
needs to get started.
Friday, 17 May 13

Rails Concepts
? DRY - “Don’t Repeat Yourself”
? Convention Over Con?guration
? REST (CRUD)
? MVC
? Don’t Repeat Yourself
Friday, 17 May 13

CRUD & REST
CRUD stands for create,read, update and destroy.
REST stands for Representational State Transfer and is basically an
expansion of CRUD.
REST uses resource identi?ers such as URLs to represent resources.
Example HTTP request:
DELETE /users/1
User resource with an id of 1, desired action - delete
Friday, 17 May 13

MVC
? Model-View-Controller
? Separates “business logic” from presentation
logic
? “Business logic” typically consists of data
models for resources (Users, Photos etc)
? Presentation logic associated with a GUI - web
pages
Friday, 17 May 13

MVC cont.
? Browser sends a request for a page (i.e. /users/16)
? Request gets received by server and passed onto a “controller”
? A controller will either immediately render a “view” (template that gets
converted to HTML) or interact with a “model”.
? Models are ruby objects that represents a resource and communicate with a
database
? After interacting with a model, the controller will then render a view
Friday, 17 May 13

Gems
A gem is a packaged Ruby application or library. It has a name (e.g. rails)
and a version (e.g. 3.2.1).
Examples:
OmniAuth
OmniAuth is a Ruby authentication framework that provides a standardized interface to many different
authentication providers such as Facebook, OpenID, and even traditional username and password.
CarrierWave
Upload files in your Ruby applications, map them to a range of ORMs, store them on di?erent backends. It works
well with Rack based web applications, such as Ruby on Rails.
Active Merchant
Active Merchant is an extraction from the e-commerce system Shopify. Shopify’s requirements for a simple and
unified API to access dozens of di?erent payment gateways with very di?erent internal APIs was the chief principle
in designing the library. It was developed for usage in Ruby on Rails web applications and integrates seamlessly as
a plugin but it also works excellently as a stand alone library.
Friday, 17 May 13

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Welcome To Ruby Rails Web Development Ruby on Rails Development Benefits and Pitfalls Understanding how the many components of digital design and development are connected is crucial for web developers. Each pillar supports the span, much like a bridge, and if any one of them fails, the entire structure falls. Both poor design and poorly written code can obliterate even the most complex design solutions. Every component contributes to the final result, a user-friendly product. We have provided you with some background information on the terms, procedures, and tools used in web development in previous posts. This article will carry on that theme. We're going to discuss one of the widely used web development tools, Ruby on Rails, and share some of its advantages and disadvantages with you. brief history A brief history will be presented first. Ruby is an open source, dynamic, object-oriented programming language with an emphasis on efficiency and productivity. The original version of the language, Ruby, which was created by Yukihiro "Matz" Matsumoto, was initially made available in the 1990s. Today, it provides power to popular services like Basecamp, Hulu, the original Twitter, and Living Social. Because Ruby offers a framework that supports a high level of developer flexibility, many businesses, including BBW, Cisco, CNET, IBM, JP Morgan, NASA, and Yahoo, employ it in some capacity. The open-source Ruby on Rails web application framework is designed to increase programmers' long-term productivity. From his work on the project management tool Basecamp at the web application firm also known as Basecamp, David Heinemeier Hansson extracted Ruby on Rails. In July 2004, Hansson first made Rails available as open source. Even well-known companies like Amazon and eBay have Rails projects. From my work on Basecamp, a project collaboration tool from 37signals, Rails (Ruby on Rails) was extracted. It was therefore driven by needs rather than predictions. And I think a large reason why we're doing so well right now is because of it. I didn't make an effort to consider what certain programmers could require for a dream job. I merely constructed what I required to complete my work cheerfully. David Heinemeier Hansson, the author of Ruby on Rails, is a different interviewee. What is Ruby on Rails? Model-view-controller (MVC) is how Rails apps work. This technique is utilized by numerous other web frameworks, including AngularJS (JavaScript), Django (Python), and CakePHP (PHP).Models, Views, and Controllers are the three components that make up the apps, according to this. These parts perform the following functions: They include the functionality needed to modify and get the many types of data the app uses. A model is represented as a class in Rails. They are not low-level data types like strings or arrays. Create the logic that connects views and models (and the data they are linked with). They perform input processing, make method calls, and send data to

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This document provides an overview of Ruby on Rails, a web application framework written in Ruby. It discusses what Ruby and Rails are, the key strengths of Rails like productivity and convention over configuration. It then demonstrates how to build a basic Rails application, including generating models and controllers, scaffolding, and adding relationships between models. The document aims to introduce developers to Ruby on Rails and demonstrate its capabilities.

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