Getting Started with Rails

Initialize your application

$ rails new rails-app

# It creates file and run 'bundle install'

$ git init
$ git add .
$ git commit -m "Base rails application"

Create your application on Scalingo

You can also use our web dashboard to achieve this operation
$ scalingo create ruby-app
Git repository detected: remote scalingo added
→ 'git push scalingo master' to deploy your app

Provision and configure your database

  • Go on the dashboard of your application.
  • Select the Addons category
  • Choose the database you want to use


Add the gem pg to your Gemfile


Add the gem mysql to your Gemfile:

gem 'mysql2', '~> v0.3.18'

Then set the following environment variable:

  • DATABASE_URL → Copy the value of SCALINGO_MYSQL_URL and replace ‘mysql://’ by ‘mysql2://’
To set an environment variable, there are two ways to do it:
  • In the "Environment" category in your dashboard
  • Using our CLI and the commands scalingo env|env-set|env-unset


To use a MongoDB database your need to add the gem mongoid to your Gemfile

Configure Mongoid

Setup your application logging

By default, rails application don’t write their logs to STDOUT but in a custom file. We expect your applications to write all their logging entries to STDOUT and STDERR according to their nature, in accordance to the 12 factors

  • Add the following gem in your Gemfile: gem "rails_12factor"

Finalize and deploy

$ bundle install
$ git add .
$ git commit -m "Configure application for Scalingo"
$ git push scalingo master

Access your application

Waiting for your application to boot...
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Yes a new application will render a 404 error The page you were looking for doesn't exist., but it’s normal, there is nothing in the project, it’s time to build your product!

schedule 30 Nov 2015