带有Ruby 2.5.1控制台的Rails 5.2.0 - `warning:``already`初始化常量FileUtils :: VERSION

Question

我目前遇到了新的rails应用程序的问题,更具体地说:

• Rails 5.2.0
• Ruby 2.5.1p57(2018-03-29 Revision 63029)[x86_64-darwin17]
• rvm 1.29.4(最新)作者:Michal Papis,Piotr Kuczynski,Wayne E. Seguin [ https://rvm.io]

当我运行时rails c,它会生成一个警告链接到fileutils gem,如下所示:

`/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:90:` `warning:` `already` initialized constant FileUtils::VERSION
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:92: warning: previous definition of VERSION was here
/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:1188: warning: already initialized constant FileUtils::Entry_::S_IF_DOOR
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1267: warning: previous definition of S_IF_DOOR was here
/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:1446: warning: already initialized constant FileUtils::Entry_::DIRECTORY_TERM
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1541: warning: previous definition of DIRECTORY_TERM was here
/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:1448: warning: already initialized constant FileUtils::Entry_::SYSCASE
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1543: warning: previous definition of SYSCASE was here
/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:1501: warning: already initialized constant FileUtils::OPT_TABLE
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1596: warning: previous definition of OPT_TABLE was here
/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:1555: warning: already initialized constant FileUtils::LOW_METHODS
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1650: warning: previous definition of LOW_METHODS was here
/usr/local/Cellar/ruby/2.5.1/lib/ruby/2.5.0/fileutils.rb:1562: warning: already initialized constant FileUtils::METHODS
/usr/local/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1657: warning: previous definition of METHODS was here

我按照本指南中概述的所有步骤进行操作http://railsapps.github.io/installrubyonrails-mac.html.

您可以按照指南或以下步骤复制问题:

1. rvm install ruby​​-2.5.1
2. rails新应用
3. cd app
4. 宝石更新
5. 捆绑更新

经过观察和解决之后,我发现Ruby 2.5的默认版本的fileutils.*是1.0.2,并且该gem update命令安装了另一个更新的版本1.1.0.因此,fileutils当我运行时,有两个版本的加载rails c.

为了解决这个问题,我--default在gem update命令中添加了选项.

gem update --default

结果,我得到了两个默认版本,可以通过运行看到gem list | grep fileutils.这是我能摆脱警告的唯一方法.

mac: gem list | grep fileutils
fileutils (default: 1.1.0, default: 1.0.2)

我写这个问题时,回答只是为了与可能遇到同样问题的人分享.我花了几个小时来解决它,因为我在互联网上找不到任何帮助.

注意:当我使用rbenv而不是rvm在macOS Sierra上时,会出现同样的问题.

如果有人有更好的方法来处理这样的问题,请告诉我.

干杯,

Answer 1

我遇到过同样的问题.您的帖子中缺少的一步是首先卸载fileutils gem,然后使用默认选项卸载gem update.

gem uninstall fileutils
Successfully uninstalled fileutils-1.1.0
gem update --default
Updating installed gems
Updating fileutils
Fetching: fileutils-1.1.0.gem (100%)
Successfully installed fileutils-1.1.0

那摆脱了冗长的fileutils消息给我.

Answer 2

这个对我有用：

bundle clean --force

bundle clean(1)
清理 Bundler 目录中未使用的 gem