Catch unsafe PostgreSQL migrations in development and run them easier in production

Dump and load relational objects between Ruby environments.

Sequent is a CQRS and event sourcing framework for Ruby.

Zero downtime migrations with ActiveRecord and PostgreSQL

Annotates Rails/ActiveRecord Models, routes, fixtures, and others based on the database schema.

Arproxy is a proxy layer that allows hooking into ActiveRecord query execution and injecting custom processing

Tools to build your double entry financial ledger

MetaWhere offers the ability to call any Arel predicate methods (with a few convenient aliases) on your Model's attributes instead of the ones normally offered by ActiveRecord's hash parameters. It also adds convenient syntax for order clauses, smarter mapping of nested hash conditions, and a debug_sql method to see the real SQL your code is generating without running it against the database. If you like the new AR 3.0 query interface, you'll love it with MetaWhere.

RSpec matcher to control SQL queries made by block of code

Scoped search makes it easy to search your ActiveRecord-based models. It will create a named scope :search_for that can be called with a query string. It will build an SQL query using the provided query string and a definition that specifies on what fields to search. Because the functionality is built on named_scope, the result of the search_for call can be used like any other named_scope, so it can be chained with another scope or combined with will_paginate. Because it uses standard SQL, it does not require any setup, indexers or daemons. This makes scoped_search suitable to quickly add basic search functionality to your application with little hassle. On the other hand, it may not be the best choice if it is going to be used on very large datasets or by a large user base.

ThumbsUp provides dead-simple voting capabilities to ActiveRecord models with karma calculation, a la stackoverflow.com.

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Dynamically build a model within an RSpec context

This version is obsolete, please use the postgres-copy gem

ActiveWarehouse ETL is a pure Ruby Extract-Transform-Load application for loading data into a database.

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

Extend ActiveRecord pluck to return hash instead of an array. Useful when plucking multiple columns.

Rails extensions for using Roar in the popular web framework.

Make your PG migrations safe.

Create temporary table-backed ActiveRecord models for use in tests