因此，我一直在尝试将 rails 应用程序部署到 heroku 并且遇到了一些问题。我在日志和 SO 上做了很多探索，但找不到任何可以为我指明正确方向的东西。再说一次，我可能会遗漏一些明显的东西。无论如何，任何帮助将不胜感激。
命令
git push -f heroku master
日志
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/config.ru:1:in `new'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/config.ru:1:in `<main>'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands/server.rb:46:in `app'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands/server.rb:70:in `start'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:55:in `block in <top (required)>'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:50:in `tap'
2012-08-28T05:56:30+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:50:in `<top (required)>'
2012-08-28T05:56:30+00:00 app[web.1]: from script/rails:6:in `require'
2012-08-28T05:56:30+00:00 app[web.1]: from script/rails:6:in `<main>'
2012-08-28T05:56:31+00:00 heroku[web.1]: Process exited with status 1
2012-08-28T05:56:31+00:00 heroku[web.1]: State changed from starting to crashed
2012-08-28T05:56:36+00:00 heroku[slugc]: Slug compilation started
2012-08-28T05:57:19+00:00 heroku[api]: Release v6 created by raphael.shejnberg@gmail.com
2012-08-28T05:57:19+00:00 heroku[api]: Deploy 8bc52ce by raphael.shejnberg@gmail.com
2012-08-28T05:57:19+00:00 heroku[web.1]: State changed from crashed to starting
2012-08-28T05:57:20+00:00 heroku[slugc]: Slug compilation finished
2012-08-28T05:57:21+00:00 heroku[web.1]: Starting process with command `bundle exec rails server -p 6287`
2012-08-28T05:57:27+00:00 app[web.1]: => Rails 3.2.3 application starting in production on http://0.0.0.0:6287
2012-08-28T05:57:27+00:00 app[web.1]: => Ctrl-C to shutdown server
2012-08-28T05:57:27+00:00 app[web.1]: Exiting
2012-08-28T05:57:27+00:00 app[web.1]: => Booting WEBrick
2012-08-28T05:57:27+00:00 app[web.1]: from /app/app/models/project.rb:1:in `<top (required)>'
2012-08-28T05:57:27+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.3/lib/active_record/dynamic_matchers.rb:50:in `method_missing': undefined method `has_attached_file' for #<Class:0x00000003d3b3e8> (NoMethodError)
2012-08-28T05:57:27+00:00 app[web.1]: => Call with -d to detach
2012-08-28T05:57:27+00:00 app[web.1]: from /app/app/models/project.rb:4:in `<class:Project>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:236:in `load_dependency'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `block in require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:359:in `require_or_load'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:502:in `load_missing_constant'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:190:in `each'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:192:in `block in const_missing'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:190:in `const_missing'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/inflector/methods.rb:229:in `block in constantize'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/inflector/methods.rb:228:in `each'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/inflector/methods.rb:228:in `constantize'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/inflector/methods.rb:259:in `safe_constantize'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/core_ext/string/inflections.rb:66:in `safe_constantize'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_controller/metal/params_wrapper.rb:152:in `_default_wrap_model'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_controller/metal/params_wrapper.rb:169:in `_set_wrapper_defaults'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_controller/metal/params_wrapper.rb:133:in `inherited'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/abstract_controller/railties/routes_helpers.rb:7:in `block (2 levels) in with'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_controller/railties/paths.rb:7:in `block (2 levels) in with'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:236:in `load_dependency'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `block in require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:359:in `require_or_load'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/app/controllers/projects_controller.rb:1:in `<top (required)>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:313:in `depend_on'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/engine.rb:438:in `each'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/engine.rb:436:in `eager_load!'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/engine.rb:439:in `block (2 levels) in eager_load!'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/engine.rb:438:in `block in eager_load!'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/engine.rb:436:in `each'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:225:in `require_dependency'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/application/finisher.rb:53:in `block in <module:Finisher>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/initializable.rb:55:in `block in run_initializers'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/initializable.rb:54:in `each'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/initializable.rb:30:in `instance_exec'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/initializable.rb:30:in `run'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/initializable.rb:54:in `run_initializers'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/application.rb:136:in `initialize!'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:30:in `method_missing'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/config.ru:4:in `block in <main>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/config/environment.rb:5:in `<top (required)>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/config.ru:4:in `require'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/config.ru:1:in `new'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/config.ru:1:in `<main>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands/server.rb:46:in `app'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands/server.rb:70:in `start'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:55:in `block in <top (required)>'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:50:in `tap'
2012-08-28T05:57:27+00:00 app[web.1]: from /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:50:in `<top (required)>'
2012-08-28T05:57:27+00:00 app[web.1]: from script/rails:6:in `<main>'
2012-08-28T05:57:27+00:00 app[web.1]: from script/rails:6:in `require'
2012-08-28T05:57:28+00:00 heroku[web.1]: Process exited with status 1
2012-08-28T05:57:28+00:00 heroku[web.1]: State changed from starting to crashed
2012-08-28T05:57:38+00:00 heroku[router]: Error H10 (App crashed) -> GET floating-sierra-9248.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=
2012-08-28T05:57:38+00:00 heroku[router]: Error H10 (App crashed) -> GET floating-sierra- 9248.herokuapp.com/favicon.ico dyno= queue= wait= service= status=503 bytes=
我必须删除部分日志才能使其格式正确且可读，这是一个弃用警告
2012-08-28T05:57:24+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:5)
（从 /app/config/environment.rb:5 调用）
环境.rb
# Load the rails application
require File.expand_path('../application', __FILE__)
# Initialize the rails application
Blog::Application.initialize!