不会为 Ruby 安装 Rest-Client答案

【问题标题】：Rest-Client will not install for Ruby不会为 Ruby 安装 Rest-Client
【发布时间】：2016-06-02 14:28:21
【问题描述】：

我正在尝试使用 rest-client gem install 运行 Ruby 应用程序。我不断收到错误消息：

C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `require': cannot load such file -- ffi (LoadError)
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `<top (required)>'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `require_relative'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `<top (required)>'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `require'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `<top (required)>'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `require'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `<top (required)>'
    from app.rb:6:in `require'
    from app.rb:6:in `<main>'

$ ./start ruby
Installing bundle
Starting server
C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `require': cannot load such file -- ffi (LoadError)
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `require_relative'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `<top (required)>'
        from app.rb:6:in `require'
        from app.rb:6:in `<main>'

但我确定 gem 已安装：

rest-client (2.0.0.rc2, 1.8.0)
rest-open-uri (1.0.0)
rest_client (1.8.3)

有谁知道我在安装过程中可能做错了什么？

【问题讨论】：

它抱怨 ffi gem，这可能是您的一个 gem 的依赖项。您是否使用捆绑器来安装这些 gem？如果没有，请尝试安装 ffi gem，尽管您可能会因另一个缺少的依赖 gem 而出现另一个错误，因此我建议通过 Bundler 安装这些。

标签： ruby rubygems installation

【解决方案1】：

问题是未安装 FFI，这也是我收到错误消息的原因。不幸的是使用

bundle install

没有正确安装它，我不得不手动安装 gem（安装时间比预期的要长得多

 gem install ffi

【讨论】：