Subject: Step 2 Make the minimum change
Author: Linux
In response to: What's going on?
Posted on: 09/10/2017 10:10:14 PM
Rails framework follows the MVC philosophy, but here the "Hello World" is the simplest one which can only the C (controller) component.
First tale a look at the default controller: "app/controllers/application_controller.rb"
class ApplicationController < ActionController::Base
protect_from_forgery with: :exception
end
Change it to:
class ApplicationController < ActionController::Base
protect_from_forgery with: :exception
def greet
render html: "Hello, World!"
end
end
Then, instruct the routing table "
config/routes.rb" to use the modified controller:
Rails.application.routes.draw do
# For details on the DSL available within this file,
see http://guides.rubyonrails.org/routing.html
root 'application#greet'
end
Here, the '
root' (/) request will be handled by "
application" controller (ApplicationController) on "
greet" action.
>
> On 09/10/2017 09:35:13 PM
Linux wrote:
Without your touch, your default empty web application is ready to go online.
First start the server, which is a built-in Puma.
-- administrator@ubuntu:~/hello_world$ rails server
=> Booting Puma
=> Rails 5.1.4 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.10.0 (ruby 2.4.0-p0), codename: Russell's Teapot
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
Secondly, on your browser, type:
Yay! Youre on Rails!
Rails version: 5.1.4
Ruby version: 2.4.0 (x86_64-linux)
It is online! But where is the "Welcome aboard" index page coming from? What's going on here?
First take a look at the routing table: "/config/routes.rb"
Rails.application.routes.draw do
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end
It's empty and the deafult should be kicked in. Take a look at the traffic log
Started GET "/" for 127.0.0.1 at 2017-09-10 14:17:31 -0700
Processing by Rails::WelcomeController#index as HTML
Rendering /home/administrator/.rvm/gems/ruby-2.4.0/gems/railties-5.1.4/lib/
rails/templates/rails/welcome/index.html.erb
Rendered /home/administrator/.rvm/gems/ruby-2.4.0/gems/railties-5.1.4/lib/
rails/templates/rails/welcome/index.html.erb (4.3ms)
Completed 200 OK in 198ms (Views: 10.0ms)
As the log indicates, the "Welcome aboard" page is coming from "lib/rails/templates/rails/welcome/index.html.erb"
References:
