Zero-Downtime migrations in Rails

Implementing Zero-Downtime migrations to avoid potential errors upon deployment. In this post we will learn about deploying rename_column migrations with.The solution involves multiple migrations deployments for a single change. This definitely sounds over-engineered than showing a maintenance page but that is what we will need to do in-order to make it smooth and deploy without affecting the online users.To make it seamless, we deploy after each of the following steps.