ruby-ensembl-api provides a ruby API to the Ensembl databases (http://www.ensembl.org)

SafeFinder lets you define model's null_object through simple DSL, and returns it when you can't find a result.

Adds useful accessors to ActiveRecord's Column object.

Extended support for foreign key constraints in ActiveRecord, including: definition as column attribute; deferrable; and SQLite3 support; cleaner dumps; and more!

Adds support for views to ActiveRecord

Plain old Ruby for generating primitive data structures from object graphs.

A bridge between using AR and a full blown schema-free db.

Small DSL to create ActiveRecord (>= 3.1) attribute predicates without writing SQL.

Allows multiple environments in database.yml, and dynamically switching them.

Simple Role System for Rails Apps

Simple, straightforward slugs for your ActiveRecord models.

Spectacles adds database view functionality to ActiveRecord. Current supported adapters include Postgres, SQLite, Vertica, and MySQL.

Grown up ActiveRecord::Store config options!

Adds unique attribute support to ActiveModel models.

CPF and CNPJ validations for ActiveModel and Rails

Define additional sets of validations beyond the standard "errors" that is tied to the ActiveRecord life-cycle. These additional sets can be defined with all the standard ActiveRecord::Validation macros, and the resulting collection is a standard ActiveRecord::Errors object.

Valle automatically sets minimum and maximum values for the fields of your ActiveRecord model(s), so you shouldn't worry, that string length or ID value will exceed the permissible limit.

Use arel predicates directly from where.

When an ActiveRecord/ActiveModel model won't save because it's invalid, this gem writes the validation error messages to the log.

Lets you use the Workflow gem with your Mongoid documents to add state machine functionality.