Create associations that combine multiple Active Record associations using a SQL UNION under the hood, with full support for joins, preloading and eager loading on the union association, as well as through-union associations.

Decorate nil Active Record associations with a null object in Rails.

Query assertions and SQL matchers for RSpec.

Wrap an Active Record transaction or query in a local statement timeout.

Assert state changes through multiple values for an object, enabling you to test complex state transitions in sequence with RSpec.