捆绑器版本存在，但 RubyGems 另有声明

Question

当我运行rails generate migration 时，我得到：

/Users/bob/.rbenv/versions/2.7.4/lib/ruby/2.7.0/rubygems.rb:277:in 'find_spec_for_exe': Could not find 'bundler' (2.2.21) required by your /Users/bob/path/to/my/project/Gemfile.lock. (Gem::GemNotFoundException)

...后跟：

To update to the latest version installed on your system, run `bundle update --bundler`.
To install the missing version, run `gem install bundler:2.2.21`

但是，bundler 显然存在：

$ gem list bundler

*** LOCAL GEMS ***

bundler (2.2.21)

$ ruby -v
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x86_64-darwin19]

$ find ~/.rbenv -name "*bundler*" | grep 2.7.4 | grep gemspec

/Users/bob/.rbenv/versions/2.7.4/lib/ruby/gems/2.7.0/specifications/bundler-2.2.21.gemspec
/Users/bob/.rbenv/versions/2.7.4/lib/ruby/gems/2.7.0/gems/bundler-2.2.21/bundler.gemspec

我追查到line 267 in rubygems.rb：

specs = dep.matching_specs(true)

（它返回一个空数组，我相信它表明它找不到匹配的规范。）

注意：我按照上述说明/建议（运行 bundle update --bundler 和 gem install bundler:2.2.21）无济于事。

Answer 1

这最终对我有用：

rbenv uninstall 2.7.4

rbenv install 2.7.4

bundle

git restore Gemfile.lock   # there were some insignificant rearrangments