CsvOmg easily lets you map CSV to objects. Inspired by happymapper.

Effortlessly print enumerables as CSV.

Simple wrapper to process csv's with a pipeline of testable processors.

csv-query

CsvWizard provides a simple framework to import CSV files into Rails models. It supports required fields, default values, row-level validation, and hooks for pre- and post-processing.

If you do not want to setup foreign keys with cascade and ActiveRecord's dependent is too slow for your big database, this is what you are looking for.

Export CSV data to database

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.

Adds support for using SQL views within ActiveRecord

Recursively traverse trees using a single SQL query

An ActiveRecord job queueing system

A console music library explorer and player

Simple record tagging

Versioning for your ActiveRecord models

Add simple versioning to ActiveRecord models.

Currency exchanger gem

This is a minimal implementation to provide the current_user method in the action controller, assuming login with omniauth.

Cursor-based pagination for ActiveRecord relations.

Cursor pagination for ruby

This ActiveRecord plugin add very basic support custom associations, without any syntactic sugar (yet).