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

进入rails 文件夹， terminal输入rails console报告❌。

类似下面的

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

直接google， 

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

就能找到stackoverflow的答案。

原因是homebrew更新了libhistory的版本到8.0。

而rails的默认配置是7.0找不到对应的库。因此建立一个符号连接即可。

cd /usr/local/opt/readline/lib/
ls -l
//可以看到这个文件夹下的文件的版本是libhistory.8.0.dylib
//所以在这个文件夹下添加一个符号连接,使用命令ln -s(bash命令)
ln -s libhistory.8.0.dylib libhistory.7.dylib 

然后rails c就可以正确打开了。