The MVC Pattern

Model View Controller (The MVC Pattern)

Model

  • An application data storage
  • Database software or the data
  • The underlying database
  • It’s the collection of Salesforce object and fields that we’d represent and modify in our page

View

  • Application user-interface
  • Look and feel, the user experience
  • In Visualforce
    • HTML, CSS, and Javascript code

Controller

  • Application logic, the middle layer between the model and the view
  • Takes data from the Model and presents it to the View
  • Takes input from the View and saves it to the Model
  • It’s the Apex code that interacts with the database according to the View’s needs
  • Controllers typically retrieve the data to be displayed in a page, takes input and saves it to the database. It contains code that executes in response to page actions, such as button being clicked

 

  • Three types of controllers:

    • Standard controllers
      • Canned, come with custom objects
    • Custom controllers
      • Need to code yourself
    • Controller extensions
      • Extensions that can be added on top of the Standard or Custom controllers
  • Why do we use MVC Pattern?

    • To separate our application into three different components to give us a module codebase
    • Easier to maintain and its scalable
    • Same reason we use Objects in SF
    • Also the same reason why we use classes in Apex
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