rails 5，rbenv - rails 控制台未启动 - 未加载库：/usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)答案

【问题标题】：rails 5, rbenv - rails console doesn't start - Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)rails 5，rbenv - rails 控制台未启动 - 未加载库：/usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)
【发布时间】：2019-07-06 17:05:08
【问题描述】：

当我在终端中运行“rails c”命令时，它不会以某种方式启动 rails 控制台并引发错误。我正在使用 rbenv 运行 rails 5.2.2。

rails c

它会引发以下错误。

Running via Spring preloader in process 13912
Traceback (most recent call last):
    50: from -e:1:in `<main>'
    49: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
    48: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
    47: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:285:in `load'
    ...
     7: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `require'
     6: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:257:in `load_dependency'
     5: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/dependencies.rb:291:in `block in require'
     4: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
     3: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
     2: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.2/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
     1: from /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require': dlopen(/Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/2.5.0/x86_64-darwin17/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)
  Referenced from: /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/2.5.0/x86_64-darwin17/readline.bundle
  Reason: image not found - /Users/wemteq/.rbenv/versions/2.5.0/lib/ruby/2.5.0/x86_64-darwin17/readline.bundle

它在一周前工作，但现在不工作。有什么想法吗？

【问题讨论】：

这个答案可能对stackoverflow.com/a/40682002/938947有帮助

标签： ruby-on-rails console rbenv

【解决方案1】：

我从一些研究中找到了 2 个解决方案。

Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)

缺少
libreadline.7.dylib，因此将 libreadline.8.0.dylib 链接到 libreadline.7.dylib 对我有用。

ln -s /usr/local/opt/readline/lib/libreadline.8.0.dylib /usr/local/opt/readline/lib/libreadline.7.dylib

libreadline 版本可能不同。您可以浏览 /usr/local/opt/readline/lib/ 目录中的可用文件。

rb-readline 开发组中的 gem 可以解决这个问题。

gem 'rb-readline'

【讨论】：