Motivation / Background

After watching @bensheldon 's talk An ok compromise. Faster development by designing for the Rails Autoloader I got motivated to try and run the script mentionned in the video on my production rails app (which runs on edge rails ).

Ben mentions that ActionText::ContentHelper is autoloaded at this timestamp

I've managed to replicate it on my own application.

Along with this script ( which I've edited a bit to display more messages and add it to our CI ):

# frozen_string_literal: true

require_relative "../../config/application"

autoloaded_constants = []

Rails.autoloaders.each do |loader|
  loader.on_load do |cpath, _value, _abspath|
    autoloaded_constants << [cpath, caller]
  end
end

Rails.application.initialize!

autoloaded_constants.each do |x|
  x[1] = Rails.backtrace_cleaner.clean(x[1]).first
end

# ActionText::ContentHelper
#
if autoloaded_constants.any?
  puts
  puts
  puts "ERROR: Autoloaded constants were referenced during during boot."
  puts
  puts "These files/constants were autoloaded during the boot process, which will result in" \
       "inconsistent behavior and will slow down and may break development mode. " \
       "Remove references to these constants from code loaded at boot. "
  puts
  puts
  w = autoloaded_constants.map { _1.first.length }.max
  autoloaded_constants.each do |name, location|
    puts "`#{name.ljust(w)}` referenced by #{location}"
  end

  exit 1
else
  puts "SUCCESS! No autoloaded constants were found during the boot process."
  exit 0
end

Detail

• I've wrapped the setting of the sanitizer around the loading of ActionView::Base
• I've removed app/helpers from the autoload once paths

Additional information

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Unrelated changes should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.