Ruby China
  • 如果有足够的资金让大家去创业，你们会干啥呢？ at 2023年12月20日

    但是可以按照国情，事故类型提供相关的指引，法律参考等，因为现在很多人想利用法律处理问题，但是不知道怎么入手。我觉得这个想法真的很好

  • 我的论坛类 SideProject 但反响不好 求提点意见 at 2021年11月10日

    这种模式好像更适合相亲网站😀

  • 发布 3 个月获得 5K Star 的 Luckysheet - 基于 MIT 协议的开源电子表格 at 2020年10月22日

    看上去很厉害

  • 分享一个我最近招聘 Rails 工程师的实战面试视频 at 2020年06月24日

    为什么要把面试者面懵呢？楼上说的对，面试不是以为难面试为目的的，是要找到适合自己团队和自己开出薪资匹配的能力者。

  • Ruby 程序员该何去何从，33 岁程序员失业后的创业分享 at 2020年05月25日

    👍 👍

  • 招聘初级 web 前端工程师 at 2020年04月02日

    其实初不初级没所谓，关键他们的初级多少钱😎

  • 用 Rails 打造的 SaaS 平台软件：Baklib at 2019年11月12日

    用户信息的页面编辑居然不能修改昵称啥的。模版背景色不能选白色？

  • 招 Ruby 花了 2 周收到 3 个简历，招 Java 花了 2 天收到 150 个简历。 at 2019年09月16日

    我毕业是找 c 的，结果干上了 ruby

  • Rails + MySQL 的个人练手项目，请大家多多指点！ at 2019年04月17日

    优秀

  • 请教 继承 父类后 需要 覆盖 父类的 private method 如何做到 在不加上 private 宣告 ，仍然是 private method at 2018年11月19日

    很奇怪的问题，我的实验例子和楼主是一样的，但结果完全和楼主的不一样，我的实验结果完全证明了 9 楼@bysxiang的结论，想知道楼主的 ruby 版本

  • Rails 5.2 中的 Credentials 和 Active Storage at 2018年10月10日

    我使用了直传阿里云 oss，奇怪的是没有数据库中没有生成 active_storage_attachments 记录，这是为什么呢？转成本地存储一切正常啊

  • 关于 rails 查询： at 2018年09月08日

    非常感谢，我确实没太多了解 scope，就之前浏览过一下源码，🙏

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    嗯，我一开始老想着清除对应的 session，苦于没有办法找到对应的 session，而没有想到加过滤器来判断是否登陆，然后登出，思路不够开阔

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    哇哇，大神终于出现了，您的方法我会一一尝试的，回复这么仔细，对于一个新手来说是真的感谢🙏 🙏 🙏

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    看上去您的这个方案是可行的，稍后尝试一下，真心感谢！

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    嗯，我的理解是：用户验证是发生在登录成功之后的，如果按照您的方法，退出的应该是当前机器上的这个用户，而不是之前机器登录的用户；还有就是，每次登录的 session_id 都不会一样的，判断是否一样貌似没有意义了。其实我现在的困惑可以转换为怎么根据 session_id 登出相应的用户。

    我这个需求按照产品的意思貌似不需要实时，只用后台登出就好了。感谢感谢！🙏

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    您这个不是用户身份验证的么，不太明白您的意思

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    这个方法我尝试过，但是没有登出，我使用两个浏览器登录同一个账户测试的

  • 系统使用 Devise 做的登录，有个需求 [同一帐号被另一台机器登录，本机器被强制退出登录]，求大神指点一下 at 2018年09月04日

    感谢感谢！ 我目前的思路是：在 users 表中增加 last_session_id 字段，用于存储上次登录生成的 session_id，登出的时候清空；然后每次登录之前检查 last_session_id 是否存在，如果存在，说明该用户已经登录，然后据此找到对应的 session 清空，但是我不知道怎么根据 session_id 找到对应的 session； 感觉原理和您给的思路差不多，但我对【自动登出】不会实操，尴尬了，看了半天 devise 源码，没看明白😭

  • 这样设计合理吗 at 2018年09月04日

    这要看业务了，如果不长更改的字段，为了查询，有少量冗余字段也没所谓，而且查询确实方便，但如果比较容易更改的字段就建议不要这么做，同步数据很麻烦，得不偿失

  • rails 项目执行 rake db:migrate 时候遇到如下错误，希望大神帮忙看看 at 2018年08月20日

    非常感谢，已经可以了🙏

  • rails 项目执行 rake db:migrate 时候遇到如下错误，希望大神帮忙看看 at 2018年08月20日

    错误日志在楼上，不知道为什么粘贴了错误日志没有回复某个人的格式

  • rails 项目执行 rake db:migrate 时候遇到如下错误，希望大神帮忙看看 at 2018年08月20日

    去掉后错误日志是这样：

    rake aborted!
Gem::LoadError: Error loading the 'mysql2' Active Record adapter. Missing a gem it depends on? can't activate mysql2 (< 0.6.0, >= 0.4.4), already activated mysql2-0.3.21. Make sure all dependencies are added to Gemfile.
/usr/local/rvm/gems/ruby-2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:404:in `block (2 levels) in replace_gem'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:6:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:950:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_handling.rb:60:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railtie.rb:136:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `each'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:328:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:27:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `<main>'

Caused by:
Gem::LoadError: can't activate mysql2 (< 0.6.0, >= 0.4.4), already activated mysql2-0.3.21. Make sure all dependencies are added to Gemfile.
/usr/local/rvm/gems/ruby-2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:404:in `block (2 levels) in replace_gem'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:6:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:950:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_handling.rb:60:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railtie.rb:136:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `each'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:328:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:27:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:migrate => db:load_config
(See full trace by running task with --trace)
  • rails 项目执行 rake db:migrate 时候遇到如下错误，希望大神帮忙看看 at 2018年08月20日

    去掉了

  • rails 项目执行 rake db:migrate 时候遇到如下错误，希望大神帮忙看看 at 2018年08月20日

    诶，在尝试了重装 mysql 之后，我怀疑是 ruby 版本太低，升级了 ruby 为 2.5.0，还是不行，那应该改是 rails 版本问题，我把 rails 版本回退到 5.1.4 然后一切都好了，但是我依然不明到底是怎么回事，rails5.2.1 到底和我本地环境有什么冲突

  • rails 项目执行 rake db:migrate 时候遇到如下错误，希望大神帮忙看看 at 2018年08月20日

    用这个 gem 是因为之前跑 rake db:migrate 时候出现如下错误：

    rake aborted!
Gem::LoadError: Error loading the 'mysql2' Active Record adapter. Missing a gem it depends on? can't activate mysql2 (< 0.6.0, >= 0.4.4), already activated mysql2-0.3.21. Make sure all dependencies are added to Gemfile.
/usr/local/rvm/gems/ruby-2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:404:in `block (2 levels) in replace_gem'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:6:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:950:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_handling.rb:60:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railtie.rb:136:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `each'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:328:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:27:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `<main>'

Caused by:
Gem::LoadError: can't activate mysql2 (< 0.6.0, >= 0.4.4), already activated mysql2-0.3.21. Make sure all dependencies are added to Gemfile.
/usr/local/rvm/gems/ruby-2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:404:in `block (2 levels) in replace_gem'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:6:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/connection_specification.rb:191:in `spec'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:950:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/connection_handling.rb:60:in `establish_connection'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railtie.rb:136:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `instance_eval'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `each'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:328:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/base.rb:27:in `<main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/usr/local/rvm/gems/ruby-2.4.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/usr/local/rvm/gems/ruby-2.4.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/usr/local/rvm/gems/ruby-2.4.0/gems/activerecord-5.2.1/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <main>'
/usr/local/rvm/gems/ruby-2.4.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.4.0/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:migrate => db:load_config
(See full trace by running task with --trace)

    貌似说缺少一些依赖，当时不知道这个 gem 基本被弃用，环境也是之前一直用的，不是很明白为什么会这样

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    安装完 mysql 就可以了，我貌似和我最近重装虚拟机后遇到的问题一样

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    灰常感谢！😀