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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, FireBir...

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

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

Migrate large tables without downtime by copying to a temporary table in chunks. The old table is not dropped. Instead, it is moved to timestamp_table_name for verification.

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

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

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.

Migrate large tables without downtime by copying to a temporary table in chunks. The old table is not dropped. Instead, it is moved to timestamp_table_name for verification.

Simple (but safe) token authentication for Rails apps or API with Devise.

Alchemy is a powerful, userfriendly and flexible Rails CMS.

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

Attach comments to your ActiveRecord queries.

Easy upload management for ActiveRecord

Nearest neighbor search for Rails

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)

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.