安装 pg gem 后无法启动 rails 服务器

Question

我使用以下命令为 postgreSQL 安装 pg gem 后遇到问题：

subst X: "C:\Program Files (x86)\PostgreSQL.4"
gem install pg -- --with-pg-dir=X:
subst X: /D

之后，当我尝试 'rails s' 命令时，我得到了这个

    $ rails s
    c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/pg- 0.18.2/lib/pg.rb:14:in `
require': cannot load such file -- 2.1/pg_ext (LoadError)
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/pg-0.18.2/lib/
pg.rb:14:in `rescue in <top (required)>'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/pg-0.18.2/lib/
pg.rb:3:in `<top (required)>'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler/runtime.rb:76:in `require'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler/runtime.rb:72:in `each'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler/runtime.rb:72:in `block in require'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler/runtime.rb:61:in `each'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler/runtime.rb:61:in `require'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.10.5
/lib/bundler.rb:134:in `require'
        from c:/Sites/myblog/config/application.rb:7:in `<top (required)>'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8
/lib/rails/commands/commands_tasks.rb:79:in `require'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8
/lib/rails/commands/commands_tasks.rb:79:in `block in server'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8
/lib/rails/commands/commands_tasks.rb:76:in `tap'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8
/lib/rails/commands/commands_tasks.rb:76:in `server'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8
/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
        from c:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8
/lib/rails/commands.rb:17:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

Imran@IMRAN-PC /c/Sites/myblog
$

此外，我还评论了 gem 'sqlite3' 并在 gem 文件中添加了 gem 'pg'。

如有任何帮助，我们将不胜感激

Answer 1

尝试卸载"pg"gem:

gem uninstall pg

然后运行包（假设 Gemfile 包含 "pg" gem）：

bundle

安装 pg gem 后无法启动 rails 服务器

Unable to start rails server after installing pg gem

postgresql

ruby-on-rails

ruby-on-rails-3