Rails contoller view
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The document discusses the Model-View-Controller (MVC) pattern and its components. It explains that the controller is responsible for handling requests, interacting with models to retrieve data, and making the model data available to views to display. Views represent the user interface and contain templates with embedded code to display data. The controller acts as the middle layer between models and views.
![HostName
Port
(default 80)
Controller
Name
Action Name
REST URL
id
class User < ApplicationController
before_action :authenticate
def show
id = params[‘id’]
…
…
end
end](https://image.slidesharecdn.com/railscontollerview-150630104637-lva1-app6892/85/Rails-contoller-view-6-320.jpg)
Rails contoller view
- 1. The MVC Pattern John Abraham Model-View-Controller
- 4. C in MVC • Controller is responsible for making sense of the request and initiates in the cycle to generate a appropriate output • A middle man between models and views • Makes the model data available to the view so it can display that data to the user, and it saves or updates data from the • REST
- 5. C in MVC cont… • A controller is a Ruby class which inherits from ApplicationController • ApplicationController inherits from ActionController::Base, which defines a number of helpful methods • Params Hash - query string & post data • Eg: “GET /clients?id=1&name=Joe” params = {‘id’ => ‘1’, ‘name’ => ‘Joe’}
- 6. HostName Port (default 80) Controller Name Action Name REST URL id class User < ApplicationController before_action :authenticate def show id = params[‘id’] … … end end
- 7. V in MVC
- 8. V in MVC • Views represent the user interface of your application. • In Rails, views are often HTML files with embedded Ruby code that perform tasks related solely to the presentation of the data. • Views handle the job of providing data to the web browser
- 9. ERB <html> <head> … … … </head> <body> Hi, this is <%= @name %>. </body> </html>
- 10. Directory Structure class UserController < ApplicationController def show @name = ‘John’ …… end end controllers/user_controller.rb <h1>Hi this is <%= @name %>.</h1> views/users/show.html.erb
- 11. Layouts <html> <head></head> <body> <%= yield %> </body> </html> <h1>Hi this is <%= @name %>.</h1> <html> <head></head> <body> Hi, this is John. </body> </html>
- 12. Thank You …