[RUBY] Preparing to create a Rails application

Creating an application


% rails _6.0.0_ new application -d mysql

-The version is specified in "6.0.0". -"Application" indicates the name of the application you want to create. -By adding the option "-d mysql" Use MYSQL as a data management tool.

Create database


default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  socket: /tmp/mysql.sock

You can set the encoding like "utf8".


% rails db:create 

Create a database with the rails command.

Routing settings


Rails.application.routes.draw do
  root to: "notes#index"

The index action of notes_controller will be called when the root path is accessed.

View and controller settings


 config.load_defaults 6.0
 config.generators do |g|
   g.stylesheets false
   g.javascripts false
   g.helper false
   g.test_framework false

Before creating a controller with the rails g command, set not to generate unnecessary files.


% rails g controller notes index

If you specify the action name after the controller name when creating the controller, ・ Index action is created in notes controller ・ Index.html.erb file is created in the notes folder of views

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