运行rails new命令时遇到错误

Question

我想开始学习 Ruby on Rails。我已经通过 RVM 安装了 ruby​​ 2.7.0。 ubuntu 20.04.3 LTS 中也默认安装了 SQLite3。我的 Rails 版本是 7.0.2.2。 命令时

rails new blog

当我运行本指南中的 ： https://guides.rubyonrails.org/getting_started.html

它抛出一个错误：

lou@lou-VirtualBox:~$ rails new blog
      create  
      create  README.md
      create  Rakefile
      create  .ruby-version
      create  config.ru
      create  .gitignore
      create  .gitattributes
      create  Gemfile
         run  git init from "."
Traceback (most recent call last):
    27: from /home/lou/.rvm/gems/ruby-2.7.0/bin/ruby_executable_hooks:24:in `<main>'
    26: from /home/lou/.rvm/gems/ruby-2.7.0/bin/ruby_executable_hooks:24:in `eval'
    25: from /home/lou/.rvm/gems/ruby-2.7.0/bin/rails:23:in `<main>'
    24: from /home/lou/.rvm/gems/ruby-2.7.0/bin/rails:23:in `load'
    23: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/exe/rails:10:in `<top (required)>'
    22: from /home/lou/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
    21: from /home/lou/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in `require'
    20: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/cli.rb:18:in `<top (required)>'
    19: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/command.rb:48:in `invoke'
    18: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/command/base.rb:87:in `perform'
    17: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor.rb:392:in `dispatch'
    16: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command'
    15: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/command.rb:27:in `run'
    14: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/commands/application/application_command.rb:26:in `perform'
    13: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/base.rb:485:in `start'
    12: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/group.rb:232:in `dispatch'
    11: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `invoke_all'
    10: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `map'
     9: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `each'
     8: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/invocation.rb:134:in `block in invoke_all'
     7: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command'
     6: from /home/lou/.rvm/gems/ruby-2.7.0/gems/thor-1.2.1/lib/thor/command.rb:27:in `run'
     5: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/generators/rails/app/app_generator.rb:328:in `create_root_files'
     4: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/generators/app_base.rb:134:in `build'
     3: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/generators/app_base.rb:134:in `public_send'
     2: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/generators/rails/app/app_generator.rb:76:in `version_control'
     1: from /home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/generators/rails/app/app_generator.rb:258:in `user_default_branch'
/home/lou/.rvm/gems/ruby-2.7.0/gems/railties-7.0.2.2/lib/rails/generators/rails/app/app_generator.rb:258:in ``': No such file or directory - git (Errno::ENOENT)

我可以找不到与我相关的问题，所以我希望有人能帮助我。

Answer 1

我解决了我的问题。看来还需要安装git。

Answer 2

要解决此问题，请安装 git。

以下是一些背景信息：

Rails 尝试从“.”运行 git init 来初始化当前工作目录中的存储库。

Rails 读取 git默认分支，参见superuser.com 上关于默认分支的这篇文章。

在 git > 中配置 init.defaultBranch 参数2.28，您可以运行 git config --global init.defaultBranch main 。

不确定为什么要这样做，但您可以使用以下控制台选项跳过此步骤：
-G、[--skip-git]、[--no-skip-git]
-p、[--pretend]、[--no-pretend]

请参阅Rails 代码 并运行 rails new --help 以了解更多信息。