Advisory locking for ActiveRecord

AR-JDBC is a database adapter for Rails' ActiveRecord component designed to be used with JRuby built upon Java's JDBC API for database access. Provides (ActiveRecord) built-in adapters: MySQL, PostgreSQL and SQLite3 as well as adapters for popular databases such as Oracle, SQLServer, DB2, FireBird and even Java (embed) databases: Derby, HSQLDB and H2. It allows to connect to virtually any JDBC-compliant database with your JRuby on Rails application.

Profile RSpec test suites

ranked-model is a modern row sorting library built for Rails 4.2+. It uses ARel aggressively and is better optimized than most other libraries.

Monitors Ruby apps and reports detailed metrics on performance to Scout.

Identify database issues before they hit production.

Automatically eager loads Rails associations as associations are traversed

Alchemy is a powerful, userfriendly and flexible Rails CMS.

This Gem adds useful methods to your Rails app to validate, display and save phone numbers.

UNIONs in ActiveRecord! Adds proper union and union_all methods to ActiveRecord::Relation.

Overrides some basic methods for the current model so that calling #destroy sets a 'deleted_at' field to the current timestamp. ActiveRecord is required.

Adds helpers to migrations and dumps foreign keys to schema.rb

N+1 auto-detection for Rails with zero false positives / false negatives

Oracle "enhanced" ActiveRecord adapter contains useful additional methods for working with new and legacy Oracle databases. This adapter is superset of original ActiveRecord Oracle adapter.

lol_dba is a small package of rake tasks that scan your application models and displays a list of columns that probably should be indexed. Also, it can generate .sql migration scripts.

Ridgepole is a tool to manage DB schema. It defines DB schema using Rails DSL, and updates DB schema according to DSL.

Action caching for Action Pack (removed from core in Rails 4.0)

RSpec matchers for database queries

PostgreSQL JSONB-based model changes tracking

Persistent event repository implementation for RubyEventStore based on ActiveRecord. Ships with database schema and migrations suitable for PostgreSQL, MySQL ans SQLite database engines. Includes repository implementation with linearized writes to achieve log-like properties of streams on top of SQL database engine.