Here's a little something to run in your Rails app's directory

sanity-score

#!/bin/sh

echo $(
  find app/controllers -path app/controllers/concerns -prune -o -type f | wc -l
) / $((
  $(egrep -r -l '<\s*ActiveRecord::Base' app/models | wc -l)
  + $(
    (
      [ -d app/models/concerns ] &&
        find app/models/concerns -type f | wc -l
    ) || echo 0
  )
  + $(
    (
      [ -d app/controllers/concerns ] &&
        find app/controllers/concerns -type f | wc -l
    ) || echo 0
  )
)) | bc -l