Step 2 -- Create a controller

Subject: Step 2 -- Create a controller
Author: Linux
In response to: Step 1 -- Create a Rails project container
Posted on: 09/12/2017 01:16:04 AM

-- administrator@ubuntu:$ cd blog

-- administrator@ubuntu:~/blog$ rails generate controller Welcome index
Running via Spring preloader in process 69075
      create  app/controllers/welcome_controller.rb
       route  get 'welcome/index'
      invoke  erb
      create    app/views/welcome
      create    app/views/welcome/index.html.erb
      invoke  test_unit
      create    test/controllers/welcome_controller_test.rb
      invoke  helper
      create    app/helpers/welcome_helper.rb
      invoke    test_unit
      invoke  assets
      invoke    coffee
      create      app/assets/javascripts/welcome.coffee
      invoke    scss
      create      app/assets/stylesheets/welcome.scss

This generated:

app/controllers/welcome_controller.rb -- a controller Welcome with action index

class WelcomeController < ApplicationController
  def index
  end
end

app/views/welcome/index.html.erb -- a view associated with controller Welcome and its action index

<h1>Welcome#index</h1>
<p>Find me in app/views/welcome/index.html.erb</p>

a routing instruction added into routing table config/routes.rb

Rails.application.routes.draw do
  get 'welcome/index'
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

Here, get 'welcome/index' maps the GET request http://<host>/welcome/index(or index.html) to controller welcome and action index.

The root request http://<host>/ is routed to the default "Rails Welcome Aboard!" page. If you want to map the root request to controller welcome and action index. You can add root 'welcome#index':

Rails.application.routes.draw do
  get 'welcome/index'
  root 'welcome#index'  
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

>
> On 09/11/2017 05:53:03 AM Linux wrote:

-- administrator@ubuntu:~$ rails new blog create create README.md create Rakefile create config.ru create .gitignore create Gemfile run git init from "." Initialized empty Git repository in /home/administrator/blog/.git/ create app create app/assets/config/manifest.js create app/assets/javascripts/application.js create app/assets/javascripts/cable.js create app/assets/stylesheets/application.css create app/channels/application_cable/channel.rb create app/channels/application_cable/connection.rb create app/controllers/application_controller.rb create app/helpers/application_helper.rb create app/jobs/application_job.rb create app/mailers/application_mailer.rb create app/models/application_record.rb create app/views/layouts/application.html.erb create app/views/layouts/mailer.html.erb create app/views/layouts/mailer.text.erb create app/assets/images/.keep create app/assets/javascripts/channels create app/assets/javascripts/channels/.keep create app/controllers/concerns/.keep create app/models/concerns/.keep create bin create bin/bundle create bin/rails create bin/rake create bin/setup create bin/update create bin/yarn create config create config/routes.rb create config/application.rb create config/environment.rb create config/secrets.yml create config/cable.yml create config/puma.rb create config/spring.rb create config/environments create config/environments/development.rb create config/environments/production.rb create config/environments/test.rb create config/initializers create config/initializers/application_controller_renderer.rb create config/initializers/assets.rb create config/initializers/backtrace_silencers.rb create config/initializers/cookies_serializer.rb create config/initializers/cors.rb create config/initializers/filter_parameter_logging.rb create config/initializers/inflections.rb create config/initializers/mime_types.rb create config/initializers/new_framework_defaults_5_1.rb create config/initializers/wrap_parameters.rb create config/locales create config/locales/en.yml create config/boot.rb create config/database.yml create db create db/seeds.rb create lib create lib/tasks create lib/tasks/.keep create lib/assets create lib/assets/.keep create log create log/.keep create public create public/404.html create public/422.html create public/500.html create public/apple-touch-icon-precomposed.png create public/apple-touch-icon.png create public/favicon.ico create public/robots.txt create test/fixtures create test/fixtures/.keep create test/fixtures/files create test/fixtures/files/.keep create test/controllers create test/controllers/.keep create test/mailers create test/mailers/.keep create test/models create test/models/.keep create test/helpers create test/helpers/.keep create test/integration create test/integration/.keep create test/test_helper.rb create test/system create test/system/.keep create test/application_system_test_case.rb create tmp create tmp/.keep create tmp/cache create tmp/cache/assets create vendor create vendor/.keep create package.json remove config/initializers/cors.rb remove config/initializers/new_framework_defaults_5_1.rb run bundle install

This will create a Rails application called blog in a blog directory with all necessary folders and files generated.

Among them, the most important ones are:
config -- the directory with configuration files, e.g. routes.rb
app/controllers -- the directory holding controllers
app/models -- the directory holding models
app/views -- the directory holding views

References:

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