mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
73 lines
3.3 KiB
Text
73 lines
3.3 KiB
Text
== Welcome to \Rails
|
||
|
||
\Rails is a web-application framework that includes everything needed to create
|
||
database-backed web applications according to the {Model-View-Controller (MVC)}[http://en.wikipedia.org/wiki/Model-view-controller] pattern.
|
||
|
||
Understanding the MVC pattern is key to understanding \Rails. MVC divides your application
|
||
into three layers, each with a specific responsibility.
|
||
|
||
The View layer is composed of "templates" that are responsible for providing
|
||
appropriate representations of your application's resources. Templates
|
||
can come in a variety of formats, but most view templates are \HTML with embedded Ruby
|
||
code (.erb files).
|
||
|
||
The Model layer represents your domain model (such as Account, Product, Person, Post)
|
||
and encapsulates the business logic that is specific to your application. In \Rails,
|
||
database-backed model classes are derived from ActiveRecord::Base. Active Record allows
|
||
you to present the data from database rows as objects and embellish these data objects
|
||
with business logic methods. Although most \Rails models are backed by a database, models
|
||
can also be ordinary Ruby classes, or Ruby classes that implement a set of interfaces as
|
||
provided by the ActiveModel module. You can read more about Active Record in its
|
||
{README}[link:files/activerecord/README_rdoc.html].
|
||
|
||
The Controller layer is responsible for handling incoming HTTP requests and providing a
|
||
suitable response. Usually this means returning \HTML, but \Rails controllers can also
|
||
generate XML, JSON, PDFs, mobile-specific views, and more. Controllers manipulate models
|
||
and render view templates in order to generate the appropriate HTTP response.
|
||
|
||
In \Rails, the Controller and View layers are handled together by Action Pack.
|
||
These two layers are bundled in a single package due to their heavy interdependence.
|
||
This is unlike the relationship between Active Record and Action Pack, which are
|
||
independent. Each of these packages can be used independently outside of \Rails. You
|
||
can read more about Action Pack in its {README}[link:files/actionpack/README_rdoc.html].
|
||
|
||
== Getting Started
|
||
|
||
1. Install \Rails at the command prompt if you haven't yet:
|
||
|
||
$ gem install rails
|
||
|
||
2. At the command prompt, create a new \Rails application:
|
||
|
||
$ rails new myapp
|
||
|
||
where "myapp" is the application name.
|
||
|
||
3. Change directory to +myapp+ and start the web server:
|
||
|
||
$ cd myapp; rails server
|
||
|
||
Run with <tt>--help</tt> or <tt>-h</tt> for options.
|
||
|
||
4. Go to http://localhost:3000 and you'll see:
|
||
|
||
"Yay! You’re on Rails!"
|
||
|
||
5. Follow the guidelines to start developing your application. You may find the following resources handy:
|
||
|
||
* The \README file created within your application.
|
||
* {Getting Started with \Rails}[http://guides.rubyonrails.org/getting_started.html].
|
||
* {Ruby on \Rails Tutorial}[https://www.railstutorial.org/book].
|
||
* {Ruby on \Rails Guides}[http://guides.rubyonrails.org].
|
||
* {The API Documentation}[http://api.rubyonrails.org].
|
||
|
||
== Contributing
|
||
|
||
We encourage you to contribute to Ruby on \Rails! Please check out the {Contributing to Rails
|
||
guide}[http://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html] for guidelines about how
|
||
to proceed. {Join us}[http://contributors.rubyonrails.org]!
|
||
|
||
|
||
== License
|
||
|
||
Ruby on \Rails is released under the {MIT License}[http://www.opensource.org/licenses/MIT].
|