Rails 控制台没有运行？

Question

刚开始从 Hartl 的教程中学习编程。我最近将 Ruby 更新到 2.3.1（使用 Rails 4.2.6），我正在尝试运行控制台，但出现此错误：

Carloss-MBP:sample_app carlosgrijalva$ rails console
/Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require': cannot load such file -- rails/commands (LoadError)
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require'
from /Users/carlosgrijalva/workspace/sample_app/bin/rails:9:in `<top (required)>'
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:268:in `load'
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:268:in `block in load'
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/carlosgrijalva/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:268:in `load'
from /Users/carlosgrijalva/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/carlosgrijalva/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'

不完全确定这意味着什么。我注意到它正在启动 Ruby 2.3.0，我没有正确更新 Ruby 吗？我应该重新安装 gems 吗？

Answer 1

安装新版本的 Ruby 后，您还需要安装 gem。如果您使用的是捆绑器，那么只需运行：

# In your folder with `Gemfile` file.
bundle install

Answer 2

关于您的 ruby​​ 问题，您需要使用 RVM 或 RBENV 更改系统上的 ruby​​ 版本。

使用 RVM：

rvm use ruby-2.3.1 --default

使用 RBENV：

rbenv global 2.3.1

然后运行：

bundle install