Notes - Rails Tutorial Chapter 3.1

Sent PR to Bundler  hopefully it will get closed soon.
This fixes the issue: Warn if the same gem (same version) is added twice. bundler/bundler-features#22

To create the static views I am mainly in the app/controllers and the app/views directories

The config directory is where Rails collects files needed for the application configuration.

app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
end

New in Rails 4

• Previous versions of Rails used PUT in place of PATCH, and Rails 4.0 still supports this usage, but PATCH matches the intended HTTP usage better and is preferred for new applications. So GET, POST, PUT, DELETE is now GET, POST, PATCH, DELETE.
  
  Idempotence  is the property of certain operations in mathematics and computer science, that can be applied multiple times without changing the result beyond the initial application. It literally means "(the quality of having) the same power", from idem + potence (same + power).