"rake db:migrate" 结果 "The bundle currently has pg locked at 0.18.4"

Question

我在 Rails 中生成了这个脚手架。然后我做了一个"rake db:migrate"。然后我得到：

[31mYou have requested:
pg >= 0
The bundle currently has pg locked at 0.18.4.
Try running `bundle update pg`[0m
[33mRun `bundle install` to install missing gems.[0m

然后我做了 "bundle update" 和 "bundle install" 结果是：

安装带有本机扩展的 pg 0.18.4 C:/jruby-9.0.4.0/lib/ruby/stdlib/rubygems/ext/ext_conf_builder.rb:39: warning: Tempfile#unlink or delete called on open file；忽略

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

C:/jruby-9.0.4.0/bin/jruby.exe -r ./siteconf20151205-6108-1bkqm97.rb     >extconf.rb
NotImplementedError: C extensions are not supported
<top> at C:/jruby-9.0.4.0/lib/ruby/stdlib/mkmf.rb:1
require at org/jruby/RubyKernel.java:939
(root) at     C:/jruby>9.0.4.0/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
<top> at extconf.rb:2
extconf failed, exit code 1
Gem files will remain installed in C:/jruby-    9.0.4.0/lib/ruby/gems/shared/gems/pg-0.18.4 for inspection.
Results logged to C:/jruby-    9.0.4.0/lib/ruby/gems/shared/extensions/universal-java-1.8/2.2.0/pg-    0.18.4/gem_make.out
An error occurred while installing pg (0.18.4), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.4'` succeeds before bundling.

在我的 Gemfile 中，我尝试将 "gem 'pg'" 设为普通，然后 "bundle install"ing，但仍然收到错误消息。

这是我的 Gemfile：

source 'https://rubygems.org'  
group :production do  
gem 'rails_12factor'  
gem 'pg'  
end  
group :development, :test do  
gem 'sqlite3'  
end  
gem 'sass-rails', '~> 4.0.3'  
gem 'uglifier', '>= 1.3.0'  
gem 'coffee-rails', '~> 4.0.0'  
gem 'jquery-rails'  
gem 'turbolinks'  
gem 'jbuilder', '~> 2.0'  
gem 'sdoc', '~> 0.4.0',          group: :doc  
gem 'tzinfo-data', platforms: [:mingw, :mswin]  
gem 'coffee-script-source', '1.8.0'

Answer 1

看起来您使用的是 Windows 机器运行 jRuby。尝试使用以下 gem 之一代替 pg：

https://github.com/jruby/activerecord-jdbc-adapter

https://github.com/headius/jruby-pg

这个答案也可能有帮助： unable to install pg gem

"rake db:migrate" 结果 "The bundle currently has pg locked at 0.18.4"

"rake db:migrate" results in "The bundle currently has pg locked at 0.18.4"

ruby

ruby-on-rails

sqlite3-ruby

pg