shoulda_matchmakers

https://github.com/app-o-matix/shoulda_matchmakers

Shoulda Matchmakers generates regression specs for existing ActiveRecord models and ActionController controllers using Shoulda Matchers. It generates specs for model validations, associations, nested attributes, enum definitions, attribute serialization, database columns and database indexes as well as controller REST routes, and before/after/around actions/filters. It can also generate FactoryGirl factories containing the minimum attributes required for the factory to create a valid object. Shoulda Matchmakers is based on the Regressor gem by Erwin Schens.