Heroku＆Rails很抱歉，但出現了問題

Question

我創建了一個項目。它在localhost上正常工作，但是當我試圖將它部署到heroku上時，它會返回「我們很抱歉，但出錯了」。這是來自教程的quity簡單的項目，我不知道問題在哪裏。

這裏是我的日誌：

2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch' 
2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/engine.rb:479:in `call' 
2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/log_tailer.rb:17:in `call' 
2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call' 
2013-03-22T19:31:10+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' 
2013-03-22T19:31:10+00:00 app[web.1]: 
2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward' 
2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/content_length.rb:14:in `call' 
2013-03-22T19:31:10+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread' 
2013-03-22T19:31:10+00:00 app[web.1]: 
2013-03-22T19:31:10+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call' 
2013-03-22T19:31:10+00:00 heroku[router]: at=info method=GET path=/ host=ancient-cliffs-5913.herokuapp.com fwd="46.72.70.205" dyno=web.1 queue=0 wait=0ms connect=2ms service=18ms status=500 bytes=643 
2013-03-22T19:31:10+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=ancient-cliffs-5913.herokuapp.com fwd="46.72.70.205" dyno=web.1 queue=0 wait=15ms connect=7ms service=23ms status=304 bytes=0 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/query_cache.rb:67:in `rescue in call' 
2013-03-22T19:31:13+00:00 app[web.1]: ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished): 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/query_cache.rb:61:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
2013-03-22T19:31:13+00:00 app[web.1]: 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `__run_callback' 
2013-03-22T19:31:13+00:00 app[web.1]: Started GET "/" for 46.72.70.205 at 2013-03-22 19:31:13 +0000 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `_run__3995827767081244094__call__3680287303298643332__callbacks' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:81:in `run_callbacks' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:16:in `block in call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/tagged_logging.rb:22:in `tagged' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:32:in `call_app' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/request_id.rb:22:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:16:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/content_length.rb:14:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/handler/webrick.rb:59:in `service' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/application.rb:223:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/static.rb:62:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/engine.rb:479:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward' 
2013-03-22T19:31:13+00:00 app[web.1]: 
2013-03-22T19:31:13+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread' 
2013-03-22T19:31:13+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/log_tailer.rb:17:in `call' 
2013-03-22T19:31:13+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/query_cache.rb:67:in `rescue in call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/query_cache.rb:61:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: Started GET "/" for 46.72.70.205 at 2013-03-22 19:31:14 +0000 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/application.rb:223:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' 
2013-03-22T19:31:14+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' 
2013-03-22T19:31:14+00:00 app[web.1]: 
2013-03-22T19:31:14+00:00 app[web.1]: ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished): 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/handler/webrick.rb:59:in `service' 
2013-03-22T19:31:14+00:00 app[web.1]: /usr/local/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/request_id.rb:22:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `_run__3995827767081244094__call__3680287303298643332__callbacks' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `__run_callback' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:81:in `run_callbacks' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/static.rb:62:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:32:in `call_app' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/content_length.rb:14:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/log_tailer.rb:17:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:16:in `block in call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:16:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/tagged_logging.rb:22:in `tagged' 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup' 
2013-03-22T19:31:14+00:00 app[web.1]: 
2013-03-22T19:31:14+00:00 app[web.1]: vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/engine.rb:479:in `call' 
2013-03-22T19:31:14+00:00 app[web.1]: 
2013-03-22T19:31:14+00:00 heroku[router]: at=info method=GET path=/ host=ancient-cliffs-5913.herokuapp.com fwd="46.72.70.205" dyno=web.1 queue=0 wait=11ms connect=22ms service=20ms status=500 bytes=643 
2013-03-22T19:31:13+00:00 heroku[router]: at=info method=GET path=/ host=ancient-cliffs-5913.herokuapp.com fwd="46.72.70.205" dyno=web.1 queue=0 wait=0ms connect=10ms service=5ms status=500 bytes=643 

這裏是我的寶石文件：

source 'https://rubygems.org' 

gem 'rails', '3.2.12' 

# Bundle edge Rails instead: 
# gem 'rails', :git => 'git://github.com/rails/rails.git' 

group :development, :test do 
    gem 'sqlite3-ruby', :require => 'sqlite3' 
end 

# Gems used only for assets and not required 
# in production environments by default. 
group :assets do 
    gem 'sass-rails', '~> 3.2.3' 
    gem 'coffee-rails', '~> 3.2.1' 

    # See https://github.com/sstephenson/execjs#readme for more supported runtimes 
    # gem 'therubyracer', :platforms => :ruby 

    gem 'uglifier', '>= 1.0.3' 
end 

gem 'jquery-rails' 

# To use ActiveModel has_secure_password 
# gem 'bcrypt-ruby', '~> 3.0.0' 

# To use Jbuilder templates for JSON 
# gem 'jbuilder' 

# Use unicorn as the app server 
# gem 'unicorn' 

# Deploy with Capistrano 
# gem 'capistrano' 

# To use debugger 
# gem 'debugger' 
group :test do 
    gem 'rspec-rails', '2.6.1' 
    gem 'webrat', '0.7.1' 
end 

Answer 1

你不必

gem 'pg' 

在你的Gemfile。你可以在本地繼續使用sqlite3進行開發，但你需要在Heroku上使用postgres，mysql，mongo。