[RUBY] Introducing CircleCI to Rails


If you introduce CircleCI to Rails and push it to GitHub, tests etc. will run automatically.


  1. Select the repository where you want to run CI with your CircleCI account
  2. Create config.yml under .circleci
  3. push


Rails app creation (created with MySQL)

$ rails new circleci_practice -d mysql

Create a suitable CRUD with scaffold.

circleci_practic $ rails g scaffold users name:string email:string

Add rspec to Gemfile and bundle install

Try writing one suitable RSpec.

Create a .circleci directory and create a config.yml

You cannot connect to MySQL on Docker as it is, so edit the host part. For the time being, I think the following feeling is fine.

  <<: *default
  database: circleci_parctice_test
 # ↓ Add this
  host:  <%= ENV['DATABASE_HOST'] } %>
version: 2

      - image: circleci/ruby:2.7.1-node
          RAILS_ENV: test
      - image: circleci/mysql:5.7
          MYSQL_DATABASE: circleci_parctice_test
    working_directory: ~/circleci_parctice
      - checkout
      - run:
          name: "bundle install"
          command: bundle install --path vendor/bundle
 #Wait until you can connect to MySQL
      - run:
          name: "waiting DB start"
          command: dockerize -wait tcp:// -timeout 1m
      - run:
          name: "initialize DB"
          command: |
            bundle exec rake db:create
            bundle exec rake db:migrate
      - run:
          name: RSpec
          command: bundle exec rspec

  version: 2
      - test

If you push with this, CI will run automatically.

in conclusion

I think it would be nice to add rubocop or slim-lint. It's faster if you use cache with yarn install or bundle install.

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