Logo Questions Linux Laravel Mysql Ubuntu Git Menu
HTML CSS JAVASCRIPT SQL PYTHON PHP BOOTSTRAP JAVA JQUERY R React Kotlin
 

What is MVC in Ruby on Rails?

Tags:

Could someone please explain MVC to me in Ruby on Rails, in layman terms. I am especially interested in understanding the Model in MVC (can't get my head around the model).

like image 333
Imran Avatar asked Dec 18 '09 23:12

Imran

People also ask

What MVC means?

MVC (Model-View-Controller) is a pattern in software design commonly used to implement user interfaces, data, and controlling logic. It emphasizes a separation between the software's business logic and display.

Is Ruby on Rails an MVC framework?

Ruby on Rails uses the Model-View-Controller (MVC) architectural pattern. MVC is a pattern for the architecture of a software application. It separates an application into the following components: Models for handling data and business logic.

Why MVC is used for?

MVC is primarily used to separate an application into three main components: Model, View, and Controller. This level is considered the lowest level when compared with the View and Controller. It primarily represents the data to the user and defines the storage of all the application's data objects.

What is MVC and how it works?

The Model-View-Controller (MVC) framework is an architectural/design pattern that separates an application into three main logical components Model, View, and Controller. Each architectural component is built to handle specific development aspects of an application.

1 Answers

Some background, MVC is a (compound) design pattern and was developed in 1979 by Trygve Reenskaug (Smalltalk).

True MVC was primarily planned for use in n-tier (non web) systems and it splits a system into 3 distinct parts, a Model, View and Controller

The Model

  • Contains data for the application (often linked to a database)
  • Contains state of the application (e.g. what orders a customer has)
  • Contains all business logic
  • Notifies the View of state changes (** not true of ROR, see below)
  • No knowledge of user interfaces, so it can be reused

The View

  • Generates the user interface which presents data to the user
  • Passive, i.e. doesn’t do any processing
  • Views work is done once the data is displayed to the user.
  • Many views can access the same model for different reasons

The Controller

  • Receive events from the outside world (usually through views)
  • Interact with the model
  • Displays the appropriate view to the user

** Classic MVC is not suited to web applications, as the model cannot send all changes to the view in an observer fashion (the view is a web page). The Model2 was introduced to overcome the changing infrastructure by JSP team in 90s . MVC Web frameworks are really not MVC, but Model2 (this is true of Ruby on Rails).

Here is a description of GUI patterns including MVC from the master, Martin Fowler GUI Architectures

The best book I have found so far is Agile Web Development with Rails. It begins by assuming no knowledge, and is quite comprehensive.

Hope this helps to shed some light for you!

like image 169
MGrev Avatar answered Oct 09 '22 12:10

MGrev
Sign in to Comment

Related questions

WPF: Binding the height of a component to another's
Listing directory contents using C and Windows
Python: Using vars() to assign a string to a variable
Converting JSON into Python dict
Show Visualizers Error "could not load this custom viewer"
How to work with varargs and reflection
Is there a shorthand term for O(n log n)?
What are the advantages and disadvantages of plug-in based architecture?
Equivalent to unix "less" command within R console
problem with Chrome form handling: input onfocus="this.select()"
nhibernate : a different object with the same identifier value was already associated with the session: 2, of entity:
How to read cpu frequency on android device [closed]

Donate For Us

If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!