Agile Web Development with Rails 7.2

We cover:

• Naming migration files
• Renaming and columns
• Creating and renaming tables
• Defining indices and keys
• Using native SQL

Chapter 23Migrations

Rails encourages an agile, iterative style of development. We don’t expect to get everything right the first time. Instead, we write tests and interact with our customers to refine our understanding as we go.

For that to work, we need a supporting set of practices. We write tests to help us design our interfaces and to act as a safety net when we change things, and we use version control to store our application’s source files, allowing us to undo mistakes and to monitor what changes day to day.

But there’s another area of the application that changes, an area that we can’t directly manage using version ...