Mule is a database migration tool based on a stand-alone version of Rails Migrations. By default, Mule uses SQL scripts instead of Migrations DSL, so no Ruby coding is required. It supports multi-database environments, including support for existing databases.

Encourage good DB practices in ActiveRecord migrations.

Manage tool for ruby script which executed to DB only once.

Durable queues which commit with database transactions.

Reap database records to YAML fixtures and seed them back.

Adds a `rails dbrunner` command that executes SQL against your database. Accepts inline SQL, .sql files, or stdin. Outputs as table, CSV, or JSON.

Dump (parts) of your database to db/seeds.rb to get a headstart creating a meaningful seeds.rb file

Add geometry features on Active Record models

Extract a subset of a relational database for use in development or testing. Provides a simple API to filter rows and preserve referential integrity.

将 Rails 项目的数据库 schema 导出为文档，支持 ruby, sql, csv, excel 格式

Unload and upload database-tables to a file-system

Tool for database maintenance.

DBViewer is a mountable Rails engine that provides a simple interface to view database tables and their records.

Database utilities

Deactivatable provides methods and a default_scope to allow ActiveRecord objects to be deactivated instead of deleted. This is useful if an object needs to be removed from general use, but it's data needs to be retained. Additionally, Deactivatable provides the ability to specify depe...

Provides automatic deadlock retry and logging functionality for ActiveRecord and MySQL

Ensure that all values in an enum are covered

DeclarativeGrid is a gem for rendering grids described in simple DSL

ActiveModel validation against duplicating records.

DeepCloning is a gem that is able to replicate a set of records in depth