Jennifer

ActiveRecord pattern implementation for Crystal with a powerful query DSL, validation, relationship definition, translation and migration mechanism. You need to choose one of the existing drivers for your DB: MySQL or Postgres; the sqlite3 adapter automatically installs the required driver for it. Jennifer allows you to maintain everything for your models - from DB migrations and field mapping to callbacks and building queries. For detailed information see the docs and API documentation. For command management Jennifer uses Sam. Due to this you can easily create/migrate/drop a database or invoke a generator to bootstrap your models and migrations. Jennifer has a built-in database migration management system. Migrations allow you to organize all database changes.