webpackerでRailsにReactを導入するまでの手順書 ref: http://qiita.com/gcfuji/items/8b56fd1855a891734204

file0.txt

$ rails new my_app

file1.txt

source 'https://rubygems.org'

git_source(:github) do |repo_name|
  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
  "https://github.com/#{repo_name}.git"
end

...

# webpackerを追加
gem 'webpacker'

group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'capybara', '~> 2.13'
  gem 'selenium-webdriver'
end

...

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

file10.txt

$ yarn start

file2.txt

$ bundle

file3.txt

$ rails webpacker:install

file4.txt

$ rails webpacker:install:react

file5.txt

$ rails g controller tests index

file7.txt

$ rails s

file8.txt

$ bin/webpack-dev-server

index.html.erb

<div id="mountNode"></div>
<%= javascript_pack_tag 'hello_react' %>

package.json

...

  "scripts": {
    "start": "rails s & bin/webpack-dev-server"
  },

...