Flutter: `<class:Array>': undefined method `deprecator' for ActiveSupport:Module (NoMethodError)

環境

• Flutter: 3.13.2
• Cocoapods: 1.13.0
• activesupport: 7.1.1

問題

Flutterのバージョンをあげようとしたらエラーが出た。

$ pod --version
/Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/gems/3.2.0/gems/activesupport-7.1.1/lib/active_support/core_ext/array/conversions.rb:108:in `<class:Array>': undefined method `deprecator' for ActiveSupport:Module (NoMethodError)

  deprecate to_default_s: :to_s, deprecator: ActiveSupport.deprecator
                                                          ^^^^^^^^^^^
Did you mean?  deprecate_constant
	from /Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/gems/3.2.0/gems/activesupport-7.1.1/lib/active_support/core_ext/array/conversions.rb:8:in `<top (required)>'
	from <internal:/Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:86:in `require'
	from <internal:/Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:86:in `require'
	from /Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/gems/3.2.0/gems/cocoapods-1.12.1/lib/cocoapods.rb:9:in `<top (required)>'
	from <internal:/Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:86:in `require'
	from <internal:/Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:86:in `require'
	from /Users/ucan/.asdf/installs/ruby/3.2.0/lib/ruby/gems/3.2.0/gems/cocoapods-1.12.1/bin/pod:36:in `<top (required)>'
	from /Users/ucan/.asdf/installs/ruby/3.2.0/bin/pod:25:in `load'
	from /Users/ucan/.asdf/installs/ruby/3.2.0/bin/pod:25:in `<main>'

• https://github.com/CocoaPods/CocoaPods/issues/12081
• https://github.com/CocoaPods/CocoaPods/pull/12082

IssueやPRを見るとバグを踏んだらしい。
まだリリースされてないけどPRはマージされてるのでCocoapodsｎ次のバージョンで解決しそう。

対策

$ gem install cocoapods -v 1.12.1
$ gem install activesupport -v 7.0.8
$ gem uninstall activesupport -v 7.1.1
$ pod --version
1.12.1

参考