db2fog provides rake tasks for backing up and restoring your DB to cloud storage providers

Automatically tests your Rails app for common database query mistakes

Obtain manual db locks to guard blocks of code from parallel execution.Supports mysql, postgres and ms-sql-server.

Standalone migrator for non Rails projects

Dead-simple gem for Rails 5 that allows to switch between database connections on-the-fly

Unload and upload database-tables to a file-system

Set default values for ActiveRecord attributes

Default where

Makes ActiveRecord defer/postpone saving the records you add to an habtm (has_and_belongs_to_many) or has_many association until you call model.save, allowing validation in the style of normal attributes. Additionally you can check inside before_save ...

The Deferring gem makes it possible to defer saving ActiveRecord associations until the parent object is saved.

Library that includes enums, and rails support for enums and bitfield sets.

An opinionated way of organizing model-view code in Ruby on Rails, based on decorators

Delayed::Job plugin to unlock jobs from dead workers

Allow you to quickly move a long call to background which then executed by resque

The second type of model inheritance supported from rails 6.1, delegated type, where each sub-model has its own database table and can be queried and created individually.

flag database records as deleted and hide them from subsequent queries

Adds a new :dependent option for ActiveRecord associations that recursively deletes all dependent records without instantiating them.

A "compiler" for the Delorean programming language

Additional real/virtual attribute change tracking independent of ActiveRecords

Denshobato - private messaging between models