在Ruby on Rails教程中设置第一个rails应用程序时，ActiveRecord :: ConnectionNotEstablished

时间：2014-01-20 21:37:45

标签： ruby-on-rails-3.2

我刚刚开始使用Michael Hartl的Ruby on Rails教程，我遇到了运行我的第一个rails服务器的问题。我收到一个我无法解决的ActiveRecord :: ConnectionNotEstablished错误，而不是正常的默认应用程序页面。

我的GemFile 

source 'https://rubygems.org'
gem 'rails', '3.2.16'
group :development do
gem 'sqlite3', '1.3.5'
end
group :assets do
gem 'sass-rails', '3.2.5'
gem 'coffee-rails', '3.2.2'
gem 'uglifier', '1.2.3'
end
gem 'jquery-rails', '2.0.2'

我的database.yml 

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  adapter: sqlite3
  database: db/test.sqlite3
  pool: 5
  timeout: 5000

production:
  adapter: sqlite3
  database: db/production.sqlite3
  pool: 5
  timeout: 5000

完整跟踪 

activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
activerecord (3.2.16) lib/active_record/query_cache.rb:67:in `rescue in call'
activerecord (3.2.16) lib/active_record/query_cache.rb:61:in `call'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.16) lib/active_support/callbacks.rb:405:in `_run__105514737__call__333040863__callbacks'
activesupport (3.2.16) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.16) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.16) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.16) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.16) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.16) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.16) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.16) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.16) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/static.rb:63:in `call'
railties (3.2.16) lib/rails/engine.rb:484:in `call'
railties (3.2.16) lib/rails/application.rb:231:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.16) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

完成跟踪完成Max的建议后： 

activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
activerecord (3.2.16) lib/active_record/query_cache.rb:67:in `rescue in call'
activerecord (3.2.16) lib/active_record/query_cache.rb:61:in `call'
activerecord (3.2.16) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.16) lib/active_support/callbacks.rb:405:in `_run__733682894__call__567347261__callbacks'
activesupport (3.2.16) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.16) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.16) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.16) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.16) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.16) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.16) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.16) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.16) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
actionpack (3.2.16) lib/action_dispatch/middleware/static.rb:63:in `call'
railties (3.2.16) lib/rails/engine.rb:484:in `call'
railties (3.2.16) lib/rails/application.rb:231:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.16) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

1 个答案:

答案 0 :(得分：0)

我估计还没有可以连接的数据库。运行rake db:create。

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