Before we start the upgrade process for Webpacker 6, we are going to create a small demo application for us to work on.
If you are upgrading an existing app or not using this series as a tutorial, you can skip this step! We will begin the formal upgrade process in the next article.
Generate a new Rails app
First we will generate new Ruby on Rails app:
rails new webpacker_6 --skip-sprockets --skip-spring --skip-webpack-install --skip-bundle
cd webpacker_6
--skip-sprockets: Skip Sprockets files--skip-spring: Don’t install Spring application preloader--skip-bundle: Don’t run bundle install--skip-webpack-install: Don’t run Webpack install
Setup the Database
bin/rails db:prepare
Turn off asset scaffolding
Prevent Rails from creating asset files when running the generators and scaffolds:
# config/application.rb
# ...
module Webpacker6
class Application < Rails::Application
config.load_defaults 6.1
+ config.generators do |g|
+ g.assets false
+ end
end
end
Add Pages Controller
Generate pages controller with a home action:
bin/rails g controller pages home
Add Root Route
Set pages#home as the root route:
# config/routes.rb
Rails.application.routes.draw do
get 'pages/home'
+ root to: 'pages#home'
# For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end
Note: Because we skipped the Webpacker install task, you will get an error if you try to start the application as is. We will fix that in the next article.