gitlab-org--gitlab-foss/doc/ci/examples/test-and-deploy-ruby-application-to-heroku.md

# Test and Deploy a ruby application with GitLab CI/CD

This example will guide you how to run tests in your Ruby on Rails application and deploy it automatically as Heroku application.

You can checkout the example [source](https://gitlab.com/ayufan/ruby-getting-started) and check [CI status](https://gitlab.com/ayufan/ruby-getting-started/builds?scope=all).

## Configure the project

This is what the `.gitlab-ci.yml` file looks like for this project:

```yaml
test:
  stage: test
  script:
  - apt-get update -qy
  - apt-get install -y nodejs
  - bundle install --path /cache
  - bundle exec rake db:create RAILS_ENV=test
  - bundle exec rake test

staging:
  stage: deploy
  script:
  - gem install dpl
  - dpl --provider=heroku --app=gitlab-ci-ruby-test-staging --api-key=$HEROKU_STAGING_API_KEY
  only:
  - master

production:
  stage: deploy
  script:
  - gem install dpl
  - dpl --provider=heroku --app=gitlab-ci-ruby-test-prod --api-key=$HEROKU_PRODUCTION_API_KEY
  only:
  - tags
```

This project has three jobs:
1. `test` - used to test Rails application,
2. `staging` - used to automatically deploy staging environment every push to `master` branch
3. `production` - used to automatically deploy production environment for every created tag

## Store API keys

You'll need to create two variables in your project's **Settings > CI/CD > Variables**:

1. `HEROKU_STAGING_API_KEY` - Heroku API key used to deploy staging app,
2. `HEROKU_PRODUCTION_API_KEY` - Heroku API key used to deploy production app.

Find your Heroku API key in [Manage Account](https://dashboard.heroku.com/account).

## Create Heroku application

For each of your environments, you'll need to create a new Heroku application.
You can do this through the [Dashboard](https://dashboard.heroku.com/).

## Create Runner

First install [Docker Engine](https://docs.docker.com/installation/).
To build this project you also need to have [GitLab Runner](https://about.gitlab.com/gitlab-ci/#gitlab-runner).
You can use public runners available on `gitlab.com`, but you can register your own:

```
gitlab-runner register \
  --non-interactive \
  --url "https://gitlab.com/" \
  --registration-token "PROJECT_REGISTRATION_TOKEN" \
  --description "ruby-2.2" \
  --executor "docker" \
  --docker-image ruby:2.2 \
  --docker-postgres latest
```

With the command above, you create a Runner that uses [ruby:2.2](https://hub.docker.com/r/_/ruby/) image and uses [postgres](https://hub.docker.com/r/_/postgres/) database.

To access PostgreSQL database you need to connect to `host: postgres` as user `postgres` without password.