Ruby on rails 3 打中错误ruuning轨道2.2.2

错误显示您正在使用prosgres，但未安装其适配器

---

只需在gem文件中添加

gem'pg'

，然后运行

bundle安装

欢迎使用堆栈溢出。如果你在这里问问题，你需要付出一些努力（并实际提出一个问题）。你应该优先考虑你的问题是@user1611081，因为你是SO的新手，你应该按照SO指南提问（看看这里）我的rails版本2.2.2中没有gem文件甚至绑定器，那么解决方案是什么请帮助我，我的rails版本2.2.2中没有gem文件甚至绑定器，那么解决方案是什么请帮助我，请在您的环境文件中指定

pg

gem。

congif.gem'pg'

in环境.rb

ruby script/server
=> Booting WEBrick...
/home/rao/Documents/homir /vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:74:in `establish_connection': Please install the postgres adapter: `gem install activerecord-postgres-adapter` (no such file to load -- active_record/connection_adapters/postgres_adapter) (RuntimeError)
    from /home/rao/Documents/homir /vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:58:in `establish_connection'
    from /home/rao/Documents/homir /vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:53:in `establish_connection'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:392:in `initialize_database'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:139:in `process'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:112:in `send'
    from ./script/../config/../vendor/rails/railties/lib/initializer.rb:112:in `run'
    from /home/rao/Documents/homir /config/environment.rb:13
    from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
    from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
    from /home/rao/Documents/homir /vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /home/rao/Documents/homir /vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /home/rao/Documents/homir /vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /home/rao/Documents/homir /vendor/rails/railties/lib/commands/servers/webrick.rb:59
    from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
    from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
    from /home/rao/Documents/homir /vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /home/rao/Documents/homir /vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /home/rao/Documents/homir /vendor/rails/activesupport/lib/active_support/dependencies.rb:153:in `require'
    from /home/rao/Documents/homir /vendor/rails/railties/lib/commands/server.rb:49
    from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
    from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
    from script/server:3