[英]Ruby on Rails- ActiveRecord::ConnectionNotEstablished on localhost:3000
I'm a Ruby on Rails beginner, following the online book Ruby on Rails Tutorial . 我是Ruby on Rails的初学者,紧跟在线图书Ruby on Rails Tutorial 。 When I do
bundle update
and bundle install
and then rails server
当我进行
bundle update
和bundle install
然后bundle install
rails server
When I connect to localhost:3000/, I get the following image: http://i.imgur.com/2RrImWs.png The GemFile I used has this content: 当我连接到localhost:3000 /时,我得到以下图像: http ://i.imgur.com/2RrImWs.png我使用的GemFile具有以下内容:
source 'http://rubygems.org'
gem 'rails', '3.1.1'
gem 'sqlite3'
group :development do
gem 'rspec-rails', '2.6.1'
end
group :test do
gem 'rspec-rails', '2.6.1'
gem 'webrat', '0.7.1'
end
group :assets do
gem 'sass-rails', '~> 3.1.4'
gem 'coffee-rails', '~> 3.1.1'
gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
Update: Database.yml file looks like this 更新:Database.yml文件看起来像这样
# 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
The Full Trace on the localhost page gives the following output: 本地主机页面上的完整跟踪提供以下输出:
activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:409:in `retrieve_connection'
activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:107:in `retrieve_connection'
activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
activerecord (3.1.1) lib/active_record/query_cache.rb:65:in `rescue in call'
activerecord (3.1.1) lib/active_record/query_cache.rb:59:in `call'
activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (3.1.1) lib/active_support/callbacks.rb:392:in `_run_call_callbacks'
activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/reloader.rb:68:in `call'
rack (1.3.10) lib/rack/sendfile.rb:101:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.1.1) lib/rails/rack/logger.rb:13:in `call'
rack (1.3.10) lib/rack/methodoverride.rb:24:in `call'
rack (1.3.10) lib/rack/runtime.rb:17:in `call'
activesupport (3.1.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.3.10) lib/rack/lock.rb:15:in `call'
actionpack (3.1.1) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.1.1) lib/rails/engine.rb:456:in `call'
railties (3.1.1) lib/rails/rack/content_length.rb:16:in `call'
railties (3.1.1) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.3.10) 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'
Add the line gem 'sqlite3', '1.3.5'
inside the development:
section in your Gemfile. 在Gemfile的
development:
部分中添加行gem 'sqlite3', '1.3.5'
。 Then run bundle install
然后运行
bundle install
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