我目前正在将 rails 项目从 v5.2.3 升级到 v6.0。我正在按照本指南升级导轨。但我只停留在第一步。一旦我更改了 gemfile 中的 rails 版本并更新了 rails 就没有任何工作。跑步rails server给我这个错误uninitialized constant ActiveRecord::ConnectionAdapters::ConnectionManagement (NameError)
以下是完整的堆栈跟踪：
53: from bin/rails:4:in `<main>'
52: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
51: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
50: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
49: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
48: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
47: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<main>'
46: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
45: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/command/base.rb:65:in `perform'
44: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
43: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
42: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
41: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `perform'
40: from /Users/shubham/.rvm/gems/ruby-2.6.0/gems/railties-6.0.0/lib/rails/commands/server/server_command.rb:138:in `tap' …我想创建一个带有标签的搜索框，但问题是当我按下标签时，活动标签不显示文本，因为我将颜色设置为白色。我要那个; 当我按下选项卡时，活动选项卡显示蓝色文本，所有其他选项卡显示蓝色背景上的白色文本。我为此使用了引导程序。
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<ul class="nav nav-tabs" style="margin-left: 20px;" id="myTab" role="tablist" >
<li class="nav-item" style="background-color:#0080FF; ">
<a class="nav-link active " id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true" style="color: white; ">Home</a>
</li>
<li class="nav-item" style="background-color:#0080FF; ">
<a class="nav-link" id="profile-tab" data-toggle="tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false" style="color:white ;">Profile</a>
</li>
<li class="nav-item" style="background-color:#0080FF; ">
<a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false" style="color:white ;">Contact</a>
</li>
</ul>
<div class="tab-content" id="myTabContent" >
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab" >...</div>
<div class="tab-pane fade" id="profile" role="tabpanel" …