Ragtime is a Clojure library for migrating structured data in a way that's database independent. It defines a common interface for expressing migrations, much like Ring defines a common interface for expressing web applications.

Add the following dependency to your deps.edn file:

dev.weavejester/ragtime {:mvn/version "0.9.4"}

Or to your Leiningen project file:

[dev.weavejester/ragtime "0.9.4"]

Ragtime needs three pieces of data to work:

1. A migratable data store
2. An ordered sequence of migrations
3. A strategy on how to deal with conflicts

A data store is an implementation of the DataStore protocol, and tells Ragtime how to record which migrations are applied to an arbitrary store of data, such as a database.

Since 0.5.0, migrations are implementations of the Migration protocol, which has three methods:

• id - returns a unique ID for the migration
• run-up! - applies the migration to a database
• run-down! - rolls back the migration in a database

Ragtime comes with a way of loading SQL migrations from files, and applying them to a SQL database.

• Getting Started
• Upgrading from 0.3.x
• Upgrading from 0.4.x
• Concepts
• SQL Migrations
• Leiningen Integration
• API docs
• Third-party Libraries

Copyright © 2024 James Reeves

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version