我是编程新手，并且在尝试使用heroku rake db：migrate
时遇到了Michael Hartl的Rails教程(in /app)
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/file_utils.rb:10: warning: already initialized constant RUBY
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED
rake aborted!
Invalid DATABASE_URL
(erb):9:in `rescue in <main>'
(erb):6:in `<main>'
/usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `eval'
/usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `result'
/app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/configuration.rb:86:in `database_configuration'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railtie.rb:58:in `block (2 levels) in <class:Railtie>'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `each'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/base.rb:1867:in `<top (required)>'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:486:in `initialize'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in `new'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in `up'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:415:in `migrate'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railties/databases.rake:142:in `block (2 levels) in <top (required)>'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:634:in `call'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:634:in `block in execute'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:629:in `each'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:629:in `execute'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:595:in `block in invoke_with_call_chain'
/usr/ruby1.9.2/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:588:in `invoke_with_call_chain'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:581:in `invoke'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2041:in `invoke_task'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2019:in `block (2 levels) in top_level'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2019:in `each'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2019:in `block in top_level'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2013:in `top_level'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:1992:in `run'
/usr/ruby1.9.2/bin/rake:31:in `<main>'
该应用程序在localserver上完美运行但完全崩溃了
应用程序中发生错误，无法提供您的页面。请稍后再试。
如果您是应用程序所有者，请查看日志以获取详细信息。
我在日志
中收到此错误2011-06-13T20:20:47+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `instance_exec'
2011-06-13T20:20:47+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `run'
2011-06-13T20:20:47+00:00 heroku[web.1]: Process exited
2011-06-13T20:20:48+00:00 heroku[web.1]: State changed from starting to crashed
2011-06-13T20:21:29+00:00 heroku[router]: Error H10 (App crashed) -> GET deep-beach-590.heroku.com/ dyno= queue= wait= service= bytes=
2011-06-13T13:21:30-07:00 heroku[nginx]: GET / HTTP/1.1 | 86.44.102.112 | 796 | http | 503
2011-06-13T20:24:25+00:00 heroku[web.1]: State changed from crashed to created
2011-06-13T20:24:25+00:00 heroku[web.1]: State changed from created to starting
2011-06-13T20:24:31+00:00 heroku[web.1]: Starting process with command: `thin -p 16433 -e production -R /home/heroku_rack/heroku.ru start`
有人认为他们知道是什么导致应用程序崩溃了吗？
编辑：重启后有更多日志
2011-06-14T12:22:46+00:00 heroku[web.1]: State changed from starting to crashed
2011-06-14T12:32:32+00:00 heroku[web.1]: State changed from crashed to created
2011-06-14T12:32:32+00:00 heroku[web.1]: State changed from created to starting
2011-06-14T12:32:42+00:00 heroku[web.1]: Starting process with command: `thin -p 14587 -e production -R /home/heroku_rack/heroku.ru start`
2011-06-14T12:32:45+00:00 app[web.1]: (erb):9:in `rescue in <main>': Invalid DATABASE_URL (RuntimeError)
2011-06-14T12:32:45+00:00 app[web.1]: from (erb):6:in `<main>'
2011-06-14T12:32:45+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `eval'
2011-06-14T12:32:45+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `result'
2011-06-14T12:32:45+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/configuration.rb:86:in `database_configuration'
2011-06-14T12:32:45+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railtie.rb:58:in `block (2 levels) in <class:Railtie>'
2011-06-14T12:32:45+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
2011-06-14T12:32:45+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
2011-06-14T12:32:45+00:00 heroku[web.1]: Process exited
2011-06-14T12:32:46+00:00 heroku[web.1]: State changed from starting to crashed
2011-06-14T12:45:03+00:00 heroku[web.1]: State changed from crashed to created
2011-06-14T12:45:03+00:00 heroku[web.1]: State changed from created to starting
2011-06-14T12:45:08+00:00 heroku[web.1]: Starting process with command: `thin -p 15727 -e production -R /home/heroku_rack/heroku.ru start`
2011-06-14T12:45:11+00:00 app[web.1]: (erb):9:in `rescue in <main>': Invalid DATABASE_URL (RuntimeError)
2011-06-14T12:45:11+00:00 app[web.1]: from (erb):6:in `<main>'
2011-06-14T12:45:11+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `eval'
2011-06-14T12:45:11+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `result'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/configuration.rb:86:in `database_configuration'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railtie.rb:58:in `block (2 levels) in <class:Railtie>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `each'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/base.rb:1867:in `<top (required)>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/app/models/user.rb:14:in `<top (required)>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:227:in `load_dependency'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:346:in `require_or_load'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:300:in `depend_on'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:216:in `require_dependency'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:138:in `block (2 levels) in eager_load!'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:137:in `each'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:137:in `block in eager_load!'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:135:in `each'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:135:in `eager_load!'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:108:in `eager_load!'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/finisher.rb:41:in `block in <module:Finisher>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `instance_exec'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `run'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:50:in `block in run_initializers'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:49:in `each'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:49:in `run_initializers'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:134:in `initialize!'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:77:in `method_missing'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/config/environment.rb:5:in `<top (required)>'
2011-06-14T12:45:11+00:00 app[web.1]: from <internal:lib/rubygems/custom_require>:29:in `require'
2011-06-14T12:45:11+00:00 app[web.1]: from <internal:lib/rubygems/custom_require>:29:in `require'
2011-06-14T12:45:11+00:00 app[web.1]: from config.ru:3:in `block (3 levels) in <main>'
2011-06-14T12:45:11+00:00 app[web.1]: from /home/heroku_rack/heroku.ru:23:in `eval'
2011-06-14T12:45:11+00:00 app[web.1]: from /home/heroku_rack/heroku.ru:23:in `block (3 levels) in <main>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.3/lib/rack/builder.rb:46:in `instance_eval'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.3/lib/rack/builder.rb:46:in `initialize'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.3/lib/rack/builder.rb:63:in `new'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.3/lib/rack/builder.rb:63:in `map'
2011-06-14T12:45:11+00:00 app[web.1]: from /home/heroku_rack/heroku.ru:18:in `block (2 levels) in <main>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.3/lib/rack/builder.rb:46:in `instance_eval'
2011-06-14T12:45:11+00:00 app[web.1]: from /home/heroku_rack/heroku.ru:11:in `block in <main>'
2011-06-14T12:45:11+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/rack-1.2.3/lib/rack/builder.rb:46:in `initialize'
2011-06-14T12:45:11+00:00 app[web.1]: from /home/heroku_rack/heroku.ru:1:in `new'
2011-06-14T12:45:11+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/thin-1.2.6/lib/thin/runner.rb:143:in `run!'
2011-06-14T12:45:11+00:00 app[web.1]: from /usr/ruby1.9.2/bin/thin:19:in `load'
2011-06-14T12:45:11+00:00 heroku[web.1]: Process exited
2011-06-14T12:45:11+00:00 heroku[web.1]: State changed from starting to crashed
2011-06-14T12:45:11+00:00 heroku[web.1]: State changed from crashed to created
2011-06-14T12:45:11+00:00 heroku[web.1]: State changed from created to starting
2011-06-14T12:45:16+00:00 heroku[web.1]: Starting process with command: `thin -p 46054 -e production -R /home/heroku_rack/heroku.ru start`
2011-06-14T12:45:20+00:00 app[web.1]: (erb):9:in `rescue in <main>': Invalid DATABASE_URL (RuntimeError)
2011-06-14T12:45:20+00:00 app[web.1]: from (erb):6:in `<main>'
2011-06-14T12:45:20+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `eval'
2011-06-14T12:45:20+00:00 app[web.1]: from /usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `result'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/configuration.rb:86:in `database_configuration'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railtie.rb:58:in `block (2 levels) in <class:Railtie>'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `each'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/base.rb:1867:in `<top (required)>'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/app/models/user.rb:14:in `<top (required)>'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:227:in `load_dependency'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:346:in `require_or_load'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:300:in `depend_on'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:216:in `require_dependency'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:138:in `block (2 levels) in eager_load!'
2011-06-14T12:45:20+00:00 app[web.1]: from /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/engine.rb:137:in `each'
2011-06-14T12:45:20+00:00 heroku[web.1]: Process exited
2011-06-14T12:45:21+00:00 heroku[web.1]: State changed from starting to crashed
2011-06-14T12:45:21+00:00 heroku[router]: Error H10 (App crashed) -> GET deep-beach-590.heroku.com/ dyno= queue= wait= service= bytes=
2011-06-14T05:45:21-07:00 heroku[nginx]: GET / HTTP/1.1 | 86.44.102.112 | 796 | http | 503
2011-06-14T12:45:21+00:00 heroku[router]: Error H10 (App crashed) -> GET deep-beach-590.heroku.com/favicon.ico dyno= queue= wait= service= bytes=
我认为这里更简单的解决方案可能是破坏应用程序并重新开始。
答案 0 :(得分：4)
确保您的数据库网址格式正确，请参阅以下答案：
How to connect to postgresql using url
试试heroku db：push postgres：// username：password @ localhost / myrailsdb。
答案 1 :(得分：4)
您很可能错过了共享数据库插件。
heroku addons:add shared-database
请参阅https://devcenter.heroku.com/articles/database#troubleshooting
答案 2 :(得分：1)
我遇到了这个错误，我在开发计划中有一个名为“HEROKU_POSTGRESQL_COLOR”的数据库。当我运行heroku pg:info时，它看起来是正确的，但我的rails应用程序崩溃时出现“无效的数据库URL”错误。
要修复它，我运行了C:\Users\Matt\heroku_apps\langural>heroku pg:promote HEROKU_POSTGRESQL_COLOR_URL，它将dev数据库提升为“生产”状态，使其成为DATABASE_URL（以及HEROKU_POSTGRESQL_COLOR）的数据库。