Model View Controller

What is MVC Before we look at MVC we need a small history of Web Technologies and design patterns CGI ASP or php or jsp Event based frameworks like ASP.NET java faces

Before we look at MVC we need a small history of Web Technologies and design patterns

CGI

ASP or php or jsp

Event based frameworks like ASP.NET java faces

Design Pattern Adhoc (Write what you feel) Event based design with various kinds of controllers Model View Controller

Adhoc (Write what you feel)

Event based design with various kinds of controllers

Model View Controller

MVC Schematic View

Client and Dispatcher Client is Typically an Http 1.0 and above compliant client like a web browser Dispatcher is typically a routing table which would dispatch a particular request to a particular controller

Client is Typically an Http 1.0 and above compliant client like a web browser

Dispatcher is typically a routing table which would dispatch a particular request to a particular controller

View HTML XML Javascript etc

HTML

XML

Javascript

etc

Controller and Actions http://localhost/controller/action/parameters If something is going to hit your website it has to be through a controller and an action Use base classes for specific controllers Load helper components in controllers Define actions of the same controller like Controller – User :: Actions – add, edit, delete

http://localhost/controller/action/parameters

If something is going to hit your website it has to be through a controller and an action

Use base classes for specific controllers

Load helper components in controllers

Define actions of the same controller like

Controller – User :: Actions – add, edit, delete

Model This is nothing but your business layer. All your business logic is written here Eg: Send Email after registration Eg: delete a relationship on delete of an entity Etc Heart of your application

This is nothing but your business layer.

All your business logic is written here

Eg: Send Email after registration

Eg: delete a relationship on delete of an entity

Etc

Heart of your application

FAQ What code goes in Model and what in Controller? Why is MVC a better design pattern Is View dumb? Model sounds like just get set methods, why do you say it is the heart? Are Controllers reusable? How are models reusable?

What code goes in Model and what in Controller?

Why is MVC a better design pattern

Is View dumb?

Model sounds like just get set methods, why do you say it is the heart?

Are Controllers reusable?

How are models reusable?

Active Records Convention over configuration Why is this called Active records Easily defining relationships Magic Methods Drawbacks

Convention over configuration

Why is this called Active records

Easily defining relationships

Magic Methods

Drawbacks