Ruby2.5.2以上でpryがどこかに飛んで行ってしまう

起きた現象

pryが正常に動かない

class HomeController < ApplicationController
  before_action :redirect_signed_in_user, only: :welcome

  def welcome; end

  def redirect_signed_in_user
    binding.pry
    redirect_to root_url if user_signed_in?
  end
end

1度目は正常に動くが

[20, 29] in /Users/ashwinhegde/code/apps/o3_crm/app/controllers/home_controller.rb
   20:
   21:   private
   22:
   23:   def redirect_signed_in_user
   24:     binding.pry
=> 25:     redirect_to root_url if user_signed_in?
   26:   end
   27:

2度目から

[117, 126] in /Users/ashwinhegde/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/devise-4.4.3/lib/devise/controllers/helpers.rb
   117:             opts[:scope] = :#{mapping}
   118:             warden.authenticate!(opts) if !devise_controller? || opts.delete(:force)
   119:           end
   120:
   121:           def #{mapping}_signed_in?
=> 122:             !!current_#{mapping}
   123:           end
   124:
   125:           def current_#{mapping}
   126:             @current_#{mapping} ||= warden.authenticate(scope: :#{mapping})
(byebug)

このように謎のコードに進んで行ってしまう。

解決策

byebugのリポジトリに同じ現象のissueが立てられていた。

Ruby2.5.2以上でbootsnapがインストールされている場合、pryが正常に起動しないらしい。

bootsnap/setupをdevelopmentのみでしかrequireしないようにboot.rbを修正。

boot.rb

ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
env = ENV['RAILS_ENV'] || 'development'

require 'bundler/setup' # Set up gems listed in the Gemfile.
require 'bootsnap/setup' if env != 'development' # Speed up boot time by caching expensive operations.