如何修复找不到'activesupport'（= 6.0.0.rc1） - 确实找到了：[activesupport-5.2.3]（Gem::MissingSpecVersionError）答案

【问题标题】：How to fix Could not find 'activesupport' (= 6.0.0.rc1) - did find: [activesupport-5.2.3] (Gem::MissingSpecVersionError)如何修复找不到'activesupport'（= 6.0.0.rc1） - 确实找到了：[activesupport-5.2.3]（Gem::MissingSpecVersionError）
【发布时间】：2019-06-14 02:38:33
【问题描述】：

我尝试在我的机器上安装 Rails 6 rc1。然后我删除每个 Active* 或 Action* gem。我遇到了这个错误。

我尝试过bundle update，但无济于事。我正在使用 rbenv。

谁能给我指点？谢谢！

➜  Desktop git:(master) ✗ rails 
Traceback (most recent call last):
    8: from /Users/xxxx/.rbenv/versions/2.6.3/bin/rails:23:in `<main>'
    7: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems.rb:303:in `activate_bin_path'
    6: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems.rb:303:in `synchronize'
    5: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems.rb:304:in `block in activate_bin_path'
    4: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/specification.rb:1420:in `activate'
    3: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/specification.rb:1438:in `activate_dependencies'
    2: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/specification.rb:1438:in `each'
    1: from /Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/specification.rb:1449:in `block in activate_dependencies'
/Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/dependency.rb:313:in `to_specs': Could not find 'activesupport' (= 6.0.0.rc1) - did find: [activesupport-5.2.3] (Gem::MissingSpecVersionError)
Checked in 'GEM_PATH=/Users/xxxx/.gem/ruby/2.6.0:/Users/xxxx/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0', execute `gem env` for more information

【问题讨论】：

标签： ruby-on-rails ruby-on-rails-6

【解决方案1】：

经过测试，我意识到railties 是罪魁祸首。

我也犯了错误卸载rails的错误方式。请参考下面找到卸载rails rc的正确方法。

所以我只需重新安装 rails 即可修复上述错误。然后我再次卸载它。然后我卸载railties

gem install rails --pre
gem uninstall rails -v 6.0.0.rc1
gem uninstall railsties -v 6.0.0.rc1

【讨论】：