我在'Ruby on Rails Tutorial'中有50页，它指示我运行bundle exec rake db：migrate命令。当我这样做时，我得到以下答案。我不知道使用--trace运行命令是否提供任何有用的信息。
似乎它与使用postgresql有关，但在那之后我完全超出了我的想法。
我该怎么做才能让它发挥作用？
非常感谢！
C:\Sites\rails_projects\demo_app>bundle exec rake db:migrate
rake aborted!
PG::ConnectionBad: could not connect to server: Connection refused (0x0000274D/1
0061)
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
C:\Sites\rails_projects\demo_app>bundle exec rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
rake aborted!
PG::ConnectionBad: could not connect to server: Connection refused (0x0000274D/1
0061)
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/postgresql_adapter.rb:831:in `initialize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/postgresql_adapter.rb:831:in `new'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/postgresql_adapter.rb:831:in `connect'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/postgresql_adapter.rb:548:in `initialize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/postgresql_adapter.rb:41:in `new'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/postgresql_adapter.rb:41:in `postgresql_connection
'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:440:in `new_connection
'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:450:in `checkout_new_c
onnection'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:421:in `acquire_connec
tion'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:356:in `block in check
out'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:355:in `checkout'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:265:in `block in conne
ction'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_conne
ction'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_handling.rb:79:in `retrieve_connection'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/connection_handling.rb:53:in `connection'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/migration.rb:863:in `initialize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/migration.rb:764:in `new'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/migration.rb:764:in `up'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/migration.rb:742:in `migrate'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-4.0.2/lib/acti
ve_record/railties/databases.rake:42:in `block (2 levels) in <top (required)>'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:240:in `call'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:240:in `block in execute'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:235:in `each'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:235:in `execute'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:179:in `block in invoke_with_call_chain'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:172:in `invoke_with_call_chain'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/task.r
b:165:in `invoke'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:150:in `invoke_task'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:106:in `block (2 levels) in top_level'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:106:in `each'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:106:in `block in top_level'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:115:in `run_with_threads'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:100:in `top_level'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:78:in `block in run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:176:in `standard_exception_handling'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/lib/rake/applic
ation.rb:75:in `run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rake-10.2.2/bin/rake:33:in
`<top (required)>'
C:/RailsInstaller/Ruby1.9.3/bin/rake:23:in `load'
C:/RailsInstaller/Ruby1.9.3/bin/rake:23:in `<main>'
Tasks: TOP => db:migrate
答案 0 :(得分：2)
这个问题可能与
重复PG::ConnectionBad - could not connect to server: Connection refused
我觉得你会在那里找到你的答案，但因为你在窗户上，你可能不会。
我在Windows上开发了一段时间的导轨。这是纯粹的痛苦。等到你开始测试
您应该使用viritualbox（或其他基于unix的操作系统）安装ubuntu，然后从那里进行rails开发。
这里有一些链接可以帮助您开始使用vbox（viritualbox的简称）
http://virtualboxes.org/images/ubuntu/
答案 1 :(得分：0)
只有在我伸出援助之后才知道我误读了我的教程。 /捂脸
我的教程要求我添加
group :production do
gem 'pg', '0.12.2'
end
而不是这样做，我将gem 'sqlite3'替换为gem 'pg'，这导致了大量混淆和歇斯底里，导致rake命令无法正常工作。
感谢大家的帮助！