我无法访问 rails 控制台答案

【问题标题】：I can not access the rails console我无法访问 rails 控制台
【发布时间】：2019-07-29 12:00:19
【问题描述】：

我无法访问 rails 控制台，我正在使用 MAC Mojave。我尝试使用以下替代方法解决，但仍然出现相同的错误。

https://gist.github.com/wbotelhos/46c37807c834ccb5bb406e426adfe347

如果我打开一个新终端并写ruby -v，ruby出现2.3.7 但是前段时间，我删除了这个版本的ruby。

但我无法彻底删除它，因为我打开了一个新终端并且版本 2.3.7 不断出现。

    rails cRunning via Spring preloader in process 42876
    /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require': dlopen(/Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/x86_64-darwin18/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)
      Referenced from: /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/x86_64-darwin18/readline.bundle
      Reason: image not found - /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/x86_64-darwin18/readline.bundle
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/irb/completion.rb:10:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/commands/console/console_command.rb:2:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:82:in `block (2 levels) in lookup'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:78:in `each'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:78:in `block in lookup'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:77:in `each'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:77:in `lookup'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command.rb:68:in `find_by_namespace'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command.rb:42:in `invoke'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/commands.rb:16:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/Desktop/Proyectos/first_web/bin/rails:9:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:286:in `load'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:286:in `block in load'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:286:in `load'
            from /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:59:in `require'
            from /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:59:in `require'
            from -e:1:in `<main>'
    Adrians-MacBook-Pro:first_web adriantapia$ rails c
    Running via Spring preloader in process 43094
    /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require': dlopen(/Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/x86_64-darwin18/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)
      Referenced from: /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/x86_64-darwin18/readline.bundle
      Reason: image not found - /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/x86_64-darwin18/readline.bundle
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/2.4.0/irb/completion.rb:10:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/commands/console/console_command.rb:2:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:82:in `block (2 levels) in lookup'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:78:in `each'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:78:in `block in lookup'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:77:in `each'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command/behavior.rb:77:in `lookup'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command.rb:68:in `find_by_namespace'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/command.rb:42:in `invoke'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/railties-5.1.6.1/lib/rails/commands.rb:16:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `block in require'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:292:in `require'
            from /Users/adriantapia/Desktop/Proyectos/first_web/bin/rails:9:in `<top (required)>'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:286:in `load'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:286:in `block in load'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:258:in `load_dependency'
            from /Users/adriantapia/.rvm/gems/ruby-2.4.4/gems/activesupport-5.1.6.1/lib/active_support/dependencies.rb:286:in `load'
            from /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:59:in `require'
            from /Users/adriantapia/.rvm/rubies/ruby-2.4.4/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:59:in `require'
            from -e:1:in `<main>'


My RVM: rvm list
   ruby-2.4.1 [ x86_64 ]
=* ruby-2.4.4 [ x86_64 ]
   ruby-2.5.1 [ x86_64 ]

ruby -v :
    ruby 2.4.4p296 (2018-03-28 revision 63013) [x86_64-darwin18]

rails -v:
Rails 5.1.6.1

【问题讨论】：

我将此 gem (gem 'rb-readline', '~> 0.5.3') 添加到开发组并已解决，但此问题发生在新项目中，我必须添加这个宝石总是，我怎样才能确定地解决它？

标签： ruby-on-rails ruby macos ruby-on-rails-4 rubygems

【解决方案1】：

也有可能是因为弹簧问题。尝试使用以下命令重新启动它：

bin/spring stop

bin/spring start

【讨论】：

【解决方案2】：

您可能针对libreadline.7.dylib 编译了您的Ruby 版本，但最近更新为libreadline.8.dylib - 例如通过运行brew upgrade。

现在 Ruby 抱怨它在 /usr/local/opt/readline/lib/ 文件夹中找不到 libreadline.7.dylib 了。

要解决此问题，请导航到该文件夹并列出其内容

$ cd /usr/local/opt/readline/lib/
$ ls -l

你可能会看到这样的东西：

... libreadline.8.0.dylib
... libreadline.8.dylib -> libreadline.8.0.dylib

然后为丢失的旧版本创建一个新的符号链接：

$ ln -s libreadline.8.0.dylib libreadline.7.dylib

第一个文件是您计算机上现有的文件，由ls -l 列出。第二个文件是错误消息中命名的缺失文件。

【讨论】：

【解决方案3】：

如果您使用的是 RVM，您可以为每个特定的 ruby 项目设置 ruby 版本。您转到项目文件夹，然后键入：

rvm list
#will return list of all installed rubies and which one you're currently using, for example:

   ruby-2.1.10 [ x86_64 ]
   ruby-2.1.2 [ x86_64 ]
   ruby-2.3.4 [ x86_64 ]
   ruby-2.3.5 [ x86_64 ]
   ruby-2.3.6 [ x86_64 ]
   ruby-2.3.7 [ x86_64 ]
=* ruby-2.4.1 [ x86_64 ]
   ruby-2.5.1 [ x86_64 ]
   ruby-2.6.1 [ x86_64 ]

然后为这个项目选择你想要的 ruby 版本：

rvm use 2.6.1 # will set RVM to use this version locally from this directory

在任何新项目或未设置本地版本的情况下设置默认 RVM 版本：

rvm use 2.6.1 --default

在你的 Rails 项目的 Gemfile 中你也可以设置 ruby 版本，你应该有这样一行：

ruby '~> 2.6.1'

对于每个 ruby 版本，如果您是第一次使用该 ruby 版本为该项目安装 gem，您可能需要在 rails 项目上至少运行一次：

bundle install

欲了解更多信息，请参阅How to set default Ruby version with RVM?

【讨论】：