Ruby on Rails 초기 구축

github에 리포지토리를 만들고 복제

$ git clone https://github.com/xxxx\rails_project

$ cat Gemfile
# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem "rails" # ←コメント外します。

$ mkdir -p vendor/bundle
$ bundle install  --path ./vendor/bundle

$ bundle exec rails new -B -d mysql -f .

Gemfile은 rails에 대해 덮어 씁니다. 그래서 다시

$ bundle install

An error occurred while installing mysql2 (0.5.2), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/'` succeeds before bundling.

$ brew install mysql
$ bundle install

default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: root
  host: 127.0.0.1

development:
  <<: *default
  database: RailsStudy_dev

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: RailsStudy_test

$ bundle exec rails db:create
$ bundle exec rails db:migrate

$ bundle exec rails server