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新規Railsプロジェクトの作成〜localhostに接続するまで

Posted at

毎回手順を調べては忘れるので、備忘録。

1.Railsをインストールする

$ mkdir rails-tutorial
$ cd rails-tutorial
$ bundle init
Writing new Gemfile to /Users/hogehoge/rails-tutorial/Gemfile

作成されたGemfileを編集。railsのコメントアウトを外す。

Gemfile
# frozen_string_literal: true
source "https://rubygems.org"

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

- # gem "rails"
+ gem "rails"
$ bundle install --path vendor/bundle

2.Railsプロジェクトを作成する

今回はDBをMySQLにして作成。

$ bundle exec rails new . -B -d mysql --skip-turbolinks --skip-test

3.DBを作成する

$ rails db:create

※ Mysql2::Error::ConnectionError: Access denied for user 'root'@'localhost' (using password: NO)のエラーが出た場合

MySQLのパスワードを設定し直す必要がある。
パスワードは、長さが8文字以上, 小文字/大文字両方が含まれており, 特殊文字が含まれているものにすること。

$ mysql_secure_installation

Securing the MySQL server deployment.

Enter password for user root: (現在のパスワードを入力)

The 'validate_password' plugin is installed on the server.
The subsequent steps will run with the existing configuration
of the plugin.
Using existing password for root.

Estimated strength of the password: 50 
Change the password for root ? ((Press y|Y for Yes, any other key for No) : (Yと入力)

New password: (新しいパスワードを入力)

Re-enter new password: (再度新しいパスワードを入力)

また、database.ymlのパスワードも変更する。

database.yml
...

default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root
  password: (新しいパスワードを入力)
  socket: /tmp/mysql.sock

...

production:
  <<: *default
  database: rails_tutorial_twitter_production
  username: rails_tutorial_twitter
  password: (新しいパスワードを入力)

4. yarnとwebpackerのインストール

$ yarn install
$ rails webpacker:install

5. サーバーを起動!

$ rails s

...

=> Booting Puma
=> Rails 6.1.6 application starting in development 
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 5.6.4 (ruby 2.6.6-p146) ("Birdie's Version")
*  Min threads: 5
*  Max threads: 5
*  Environment: development
*          PID: 43735
* Listening on http://127.0.0.1:3000
* Listening on http://[::1]:3000
Use Ctrl-C to stop

http://localhost:3000/にアクセス。
↓の画面が表示されればOK
image.png

6. GitHubにpushする

GitHubで新規リポジトリを作成しておく。

$ git init
$ git add .
$ git commit -m "initial commit"
$ git remote add origin https://github.com/username/rails-tutorial.git
$ git push -u origin master

おしまい!

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