ruby - 瘦找不到 pg_ext

Question

我正在尝试运行命令

thin -R lat.ru start

在目录 50web\servers\dev 中(lat.ru 是开源项目 50web 的一部分)。

我收到以下错误:

D:\dev\derek\50web\servers\dev>thin -R lat.ru start
C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require': ca
nnot load such file -- 2.1/pg_ext (LoadError)
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/pg-0.18.4/lib/pg.rb:14:in `rescu
e in <top (required)>'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/pg-0.18.4/lib/pg.rb:3:in `<top (
required)>'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in
 `require'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in
 `rescue in require'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:144:in
 `require'
        from C:/Ruby21/lib/ruby/site_ruby/2.1.0/getdb.rb:11:in `<top (required)>
'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
        from D:/dev/derek/50web/routes/lat.rb:2:in `<top (required)>'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
        from C:/Ruby21/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
        from lat.ru:3:in `block in <main>'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:5
5:in `instance_eval'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/rack-1.6.4/lib/rack/builder.rb:5
5:in `initialize'
        from lat.ru:1:in `new'
        from lat.ru:1:in `<main>'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/lib/rack/adapter/load
er.rb:33:in `eval'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/lib/rack/adapter/load
er.rb:33:in `load'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/lib/thin/controllers/
controller.rb:182:in `load_rackup_config'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/lib/thin/controllers/
controller.rb:72:in `start'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/lib/thin/runner.rb:20
0:in `run_command'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/lib/thin/runner.rb:15
6:in `run!'
        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/thin-1.6.4/bin/thin:6:in `<top (
required)>'
        from C:/Ruby21/bin/thin:23:in `load'
        from C:/Ruby21/bin/thin:23:in `<main>'

我正在使用 pg 0.18.4，这似乎是最新版本:

D:\dev\derek\50web\servers\dev>gem list pg

*** LOCAL GEMS ***

pg (0.18.4)

D:\dev\derek\50web\servers\dev>gem update pg
Updating installed gems
Nothing to update

Ruby 版本是 2.1.7p400(2015-08-18 修订版 51632)[i386-mingw32]。

我该如何修复这个错误？

更新 1(02.02.2016 08:08 MSK):

我必须在不同的机器上运行同一个项目:

C:\usr\dp\dev\derek\50web\servers\dev>ruby lat.ru
C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- 2.2/pg_ext (LoadError)
        from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from C:/Ruby22/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg.rb:14:in `rescue in <top (required)>'
        from C:/Ruby22/lib/ruby/gems/2.2.0/gems/pg-0.18.4/lib/pg.rb:3:in `<top (required)>'
        from C:/Ruby22/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `require'

我注意到 Ruby 似乎在 2.2/pg_ext 目录中寻找 pg_ext 文件，而实际上它安装在 C:\Ruby22\lib\ruby\gems\2.2.0\gems\pg-0.18.4\lib 目录。

Answer 1

看起来 pg gem 的 C 扩展部分的安装已损坏。

• 确保安装了 postgresql 开发库
• 重新安装pg gem，看看有没有报错

使用 -f 强制标志重新安装，或者更好的 gem uninstall 和 gem install 重新安装。