Understanding Ruby on Rails Active Record Migrations

Hi, My name is Andy Leverenz and I work as a Product Designer at Dribbble. For fun, I design, code, and write. Check out my blog called Web-Crunch https://web-crunch.com where I publish design and development tutorials with the occasional vlog.

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Active Record migrations (within Ruby on Rails) are a convenient way to alter your database schema of a period of time. This overview/guide is a look at just what you can achieve with migrations and why they are the backbone of any given Ruby on Rails application. We'll talk about conventions, techniques, and how to extend a migration to fit your application's own respective needs.

What are migrations?

Active Record migrations use a Ruby DSL (Domain specific language) to generate the necessary SQL automatically so you don't have to author it by hand. This allows you to keep your schema changes to be database independent.

Think of each migration as a new version of the database. You can add to the schema or subtract from the schema.

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