ruby-on-rails - 运行 rails new 时出现 Rubygems 问题

Question

抱歉，这可能是一个基本问题，但我是 Rails 新手。
我想通过命令 rails new projName 开始一个新的 rails 项目.在这个过程中，我收到了这条消息:

run  bundle install

Your user account isn't allowed to install to the system Rubygems.
You can cancel this installation and run:

bundle install --path vendor/bundle

to install the gems into ./vendor/bundle/, or you can enter your password
and install the bundled gems to Rubygems using sudo.

Password:

我不太确定是否应该提供我的密码，但我搜索了 I found that it is safe to do that (或者至少是我所理解的)。

最后我收到了这个警告:

Warning: You're using Rubygems 2.0.14 with Spring. Upgrade to at least Rubygems 2.1.0 and run `gem pristine --all` for better startup performance.
* bin/rake: spring inserted
* bin/rails: spring inserted

所以我试着运行 gem install Rubygems我得到了:

ERROR:  Could not find a valid gem 'Rubygems' (>= 0) in any repository
ERROR:  Possible alternatives: ruby_gem, ruby_gem_eg, ruby-rets, ruby-gen, rubyless

我试过 gem install rubygems-update我得到了:

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

我已经通过 RVM 安装了 rails，但我不确定为什么会出现这些权限问题。由于我对 gem 没有经验，所以我被困住了，不知道如何解决这些问题。

Answer 1

运行以下程序就足够了:

gem update --system

将 Rubygem 升级到最新版本。