弃用警告：初始化自动加载常量 ActionText::ContentHelper 和 ActionText::TagHelper

Question

我试图理解弃用警告：

DEPRECATION WARNING: Initialization autoloaded the constants 
ActionText::ContentHelper and ActionText::TagHelper.

Being able to do this is deprecated. Autoloading during initialization is 
going
to be an error condition in future versions of Rails.

Reloading does not reboot the application, and therefore code executed during
initialization does not run again. So, if you reload 
ActionText::ContentHelper, for example,
the expected changes won't be reflected in that stale Module object.

These autoloaded constants have been unloaded.

In order to autoload safely at boot time, please wrap your code in a reloader
callback this way:

Rails.application.reloader.to_prepare do
  # Autoload classes and modules needed at boot time here.
end

That block runs when the application boots, and every time there is a reload.
For historical reasons, it may run twice, so it has to be idempotent.

Check the "Autoloading and Reloading Constants" guide to learn more about how
Rails autoloads and reloads.
 (called from <top (required)> at 
/home/keith/development/pciapp/config/environment.rb:5)

此弃用警告是什么意思以及如何解决它？

Answer 1

一些调查揭示了我的 Rails 6.1 应用程序中此弃用警告的两个来源。

1. 我在几个初始化程序中引用了 ActionMailer::Base。根据 Rails 指南 ( https://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration ) 中的建议，我决定将所有这些引用移至environment.rb。

2. mailgun-ruby gem v 1.2.3 显然也产生了相同的弃用错误。看来弃用警告已在 v 1.2.4 中修复。