What are Preview Deployments?
Preview Deployments automatically build and deploy a (private) preview version of your application whenever you commit changes to your repo. The preview runs alongside your active application and helps you to quickly test changes to your code without having to deploy to a separate environment.

What is Cloud 66?
Cloud 66 gives you everything you need to build, deploy and maintain your applications on any cloud, without the headache of dealing with “server stuff”.

Useful links:

• Using Preview Deployments: https://help.cloud66.com/rails/how-to-guides/deployment/preview-deployments.html
• Preview and database migrations: https://help.cloud66.com/rails/how-to-guides/deployment/preview-deployments.html#previews--database-migrations
• Cloud 66 - How it works: https://www.cloud66.com/how-it-works
• Cloud 66: https://www.cloud66.com/