benedictus

https://github.com/tonyaraujop/benedictus

Benedictus is a Rails developer's CLI for inspecting the execution plan of any ActiveRecord relation, scope, or query object. It boots the host Rails app, evaluates the expression you pass in, runs EXPLAIN (or EXPLAIN ANALYZE inside a rolled-back transaction), parses the JSON plan, and renders it as a colored, annotated tree with inline performance warnings.