It uses activerecord's notifications to run an explain query on each query that uses a WHERE statement

Extends ActiveRecord functionality by adding better finder/query support, as well as supporting mass data import, foreign key, CSV and temporary tables

Some basic tools for helping DMs/players run PathfinderRPG games. This project uses trademarks and/or copyrights owned by Paizo Publishing, LLC, which are used under Paizo's Community Use Policy. We are expressly prohibited from charging you to use or access this content. This project is not publ...

Wye provides users of ActiveRecord 3.2 with scopes and block methods for contextual execution of database queries on alternative database connections. Wye's patterns are most useful to applications making use of either replicated or federated databases.

Supports MongoDB style sharding and mirroring

ActiveRecord Tableless provides a simple mixin for creating models that are not bound to the database. This approach is mostly useful for capitalizing on the features ActiveRecord::Validation

Provides methods to fetch, cache and utilise historic exchange rates in your app.

Gem for automatic scaffolding by Ermes-x.

Full control over schedules for use with adnX's xTeam software

A Rails model validation, my first gem, just a practice work

Xylem provides a simple way to store and retrieve hierarchical data through ActiveRecord.

http://yalebulldogs.com/

DbCharmer is a Rails plugin (and gem) that could be used to manage AR model connections, implement master/slave query schemes, sharding and other magic features many high-scale applications need.

A Ruby gem for YAML serialization and deserialization of ActiveRecord models with JSON schema generation.

I'll clean your data

Yet another paginator for Ruby on Rails adding pagination and filtering interface to ActiveRecords.

Yet another publish subscribe gem

The goal of this gem is to facilitates the use of Active Record in non Rails projects. The tasks in the db namespace that we use when developing Rails applications are a nice part of our lifes, so this gem tries to glue this in your application too.

YDD is a tool (a fork of yaml_db really) to make it generally easy to use it for things like copying databases from production to staging and the like.

Makes working with weeks more fun