Docker for Rails Developers

Quick Recap

In this chapter, we learned how to set up and configure a database for our Rails app—something the vast majority of Rails apps typically need.

Let’s review what we covered:

• We started up a Postgres server in a container using Compose.

• We verified that the Postgres server was running by connecting with the Postgres client from a separate container.

• We configured our Rails app to talk to Postgres by installing the Postgres gem, modifying our database.yml file, and running the Rake task to create the databases.

• We put our new database through its paces by generating a scaffold, running migrations, and inserting, deleting, and updating records.

• We discussed why it’s a good idea to decouple our database container from data we want to persist. ...