我升級到 Rails 7 和 Ruby 3.1。在嘗試運行測驗時，rspec我收到以下錯誤。我該如何解決？
An error occurred while loading rails_helper.
Failure/Error: require File.expand_path('../config/environment', __dir__)
LoadError:
cannot load such file -- net/smtp
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:34:in `require'
# .../gems/zeitwerk-2.5.2/lib/zeitwerk/kernel.rb:36:in `require'
# .../gems/mail-2.7.1/lib/mail.rb:9:in `<module:Mail>'
# .../gems/mail-2.7.1/lib/mail.rb:3:in `<main>'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
# .../gems/zeitwerk-2.5.2/lib/zeitwerk/kernel.rb:36:in `require'
# .../bundler/gems/rails-6a0f6c4d70b1/actionmailbox/lib/action_mailbox/mail_ext.rb:3:in `<main>'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
# .../gems/zeitwerk-2.5.2/lib/zeitwerk/kernel.rb:36:in `require'
# .../bundler/gems/rails-6a0f6c4d70b1/actionmailbox/lib/action_mailbox.rb:3:in `<main>'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
# .../gems/zeitwerk-2.5.2/lib/zeitwerk/kernel.rb:36:in `require'
# .../bundler/gems/rails-6a0f6c4d70b1/actionmailbox/lib/action_mailbox/engine.rb:9:in `<main>'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
# .../gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
# .../gems/zeitwerk-2.5.2/lib/zeitwerk/kernel.rb:36:in `require'
# ./config/application.rb:11:in `<top (required)>'
# ./config/environment.rb:2:in `require_relative'
# ./config/environment.rb:2:in `<top (required)>'
# ./spec/rails_helper.rb:4:in `require'
# ./spec/rails_helper.rb:4:in `<top (required)>'
No examples found.
Finished in 0.00005 seconds (files took 0.57758 seconds to load)
0 examples, 0 failures, 1 error occurred outside of examples
uj5u.com熱心網友回復：
添加gem 'net-smtp', require: false到您的Gemfile并運行bundle.
同樣我想你可能有問題net-imap，并net-pop因此不得不將它們添加到一個新mail的寶石版本發布。
相關拉取請求和問題：
- mikel/mail：添加以前的默認 gem 作為 Ruby 3.1 兼容性的依賴項
- 為錯誤報告模板添加 net/smtp gem 以支持 Ruby 3.1
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