无法在Ruby on Rails 4.1.4中安装activerecord

我无法在Ruby on Rails 4.1.4中安装activerecord 。

我已经在gem 'activeadmin', github: 'activeadmin'添加了gem 'activeadmin', github: 'activeadmin'并运行bundle install 。 它返回0，所以我试图运行rails g active_admin:install命令，但它返回以下错误：

NameError：未定义的局部变量或方法install’for install' for main:Object from (irb):3 from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/console.rb:90:in start’来自E：/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/console.rb： 9： start' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:69:in console’来自E ：/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:40:in run_command!' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands.rb:17:in run_command!' from E:/software/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.1.4/lib/rails/commands.rb:17:in E：/ work / projects / src / technical_support_timer / bin / rails：4：in require' from E:/work/projects/src/technical_support_timer/bin/rails:4:in in’from -e：1：in load' from -e:1:in ‘

为什么？ 我究竟做错了什么？ 我该如何解决？

提前致谢。

Answer 1

IRB可供您试用Ruby命令或片段并查看即时响应。 如果你想安装或更新gem，我建议你先quit IRB，然后按照你手上的说明进行操作。