Heroku Cedar Rails 3.1 db:迁移失败

Question

我是第一次使用heroku，第一次使用postgres新手，并且在部署到heroku时遇到了一些困难。

我的应用程序在我的机器上工作得很好，但当我试图访问myapp.heroku.com时，我得到一个status=500。

My steps these far:

$ lunchy start postgres
$ createdb -Ouser -Eutf8 myapp_development
$ createdb -Ouser -Eutf8 myapp_test
$ rails new myapp --development=postgresql 
$ cd myapp
$ git init 
$ git add .
$ git commit -m "init"
$ git push -u origin master
$ heroku create --stack cedar
$ git push heroku master
>>>>Some simple app scaffolding<<<<<
$ git add .
$ git commit -m "simple scaffolding"
$ git push 
$ git push heroku 
$ heroku run rake db:migrate

命令似乎在运行，但是没有看到正在创建任何表。

Procfile内容:

web: bundle exec thin start -p $PORT -e $RACK_ENV

英雄日志显示:

2011-11-18T08:01:28+00:00 app[run.6]: Awaiting client
2011-11-18T08:01:28+00:00 app[run.6]: Starting process with command `bundle exec rake db:migrate`
2011-11-18T08:01:29+00:00 heroku[run.6]: State changed from starting to up
2011-11-18T08:01:33+00:00 heroku[run.6]: Process exited
2011-11-18T08:01:35+00:00 heroku[run.6]: State changed from up to complete
2011-11-18T08:03:21+00:00 heroku[router]: GET myapp.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=9ms status=500 bytes=728
2011-11-18T08:03:23+00:00 heroku[router]: GET myapp.herokuapp.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=17ms status=304 bytes=0
2011-11-18T08:04:18+00:00 app[web.1]: 
2011-11-18T08:04:18+00:00 app[web.1]: 
2011-11-18T08:04:18+00:00 app[web.1]: Started GET "/" for 101.171.144.139 at 2011-11-18 08:04:18 +0000
2011-11-18T08:04:18+00:00 app[web.1]:   Processing by PagesController#home as HTML
2011-11-18T08:04:18+00:00 app[web.1]: Rendered pages/home.html.erb within layouts/application (0.2ms)
2011-11-18T08:04:18+00:00 app[web.1]: Rendered layouts/_head.html.erb (0.9ms)
2011-11-18T08:04:18+00:00 app[web.1]: Completed 500 Internal Server Error in 2ms
2011-11-18T08:04:18+00:00 app[web.1]: 
2011-11-18T08:04:18+00:00 app[web.1]: ActionView::Template::Error (custom.css isn't precompiled):
2011-11-18T08:04:18+00:00 app[web.1]:     7:   <meta name="viewport" content="width=device-width" />
2011-11-18T08:04:18+00:00 app[web.1]:     8:   <title><%= title %></title>
2011-11-18T08:04:18+00:00 app[web.1]:     9:   <%= stylesheet_link_tag    "application" %>
2011-11-18T08:04:18+00:00 app[web.1]:     10:   <%= stylesheet_link_tag 'custom', :media => 'screen' %>
2011-11-18T08:04:18+00:00 app[web.1]:     11:   <%= javascript_include_tag "application" %>
2011-11-18T08:04:18+00:00 app[web.1]:     12:   <%= csrf_meta_tags %>
2011-11-18T08:04:18+00:00 app[web.1]:     13: </head>
2011-11-18T08:04:18+00:00 app[web.1]:   app/views/layouts/_head.html.erb:10:in `_app_views_layouts__head_html_erb___3427718828002391478_29348560'
2011-11-18T08:04:18+00:00 app[web.1]:   app/views/layouts/application.html.erb:4:in `_app_views_layouts_application_html_erb___1135382871397557001_29029960'
2011-11-18T08:04:18+00:00 app[web.1]: 
2011-11-18T08:04:18+00:00 heroku[router]: GET myapp.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=13ms status=500 bytes=728
2011-11-18T08:04:18+00:00 app[web.1]: 
2011-11-18T08:04:18+00:00 app[web.1]: cache: [GET /] miss
2011-11-18T08:04:19+00:00 app[web.1]: cache: [GET /favicon.ico] stale, invalid, store

我有一个custom。css没有预编译所以我做了

$ RAILS_ENV=production bundle exec rake assets:precompile

此预编译成public/assets。然后再

$ git add. 
$ git push
$ git heroku push
$ heroku rake db:migrate
$ heroku open

重新运行，仍然在日志中得到相同的错误。

我做错了什么?

Gemfile:

gem 'rails', '3.1.1'
gem 'pg'
gem 'thin'
gem 'foreman'
gem 'heroku'
group :development do
  gem 'rspec-rails'
end
group :test do
  gem 'rspec-rails'
  gem 'webrat'
end
group :assets do
  gem 'sass-rails',   '~> 3.1.4'
  gem 'coffee-rails', '~> 3.1.1'
  gem 'uglifier', '>= 1.0.3'
  gem 'zurb-foundation'
end
gem 'jquery-rails'

的形式:

development:
  adapter: postgresql
  encoding: unicode
  database: myapp_development
  pool: 5
  username: user
  password: password
test:
  adapter: postgresql
  encoding: unicode
  database: myapp_test
  pool: 5
  username: user
  password: password
production:
  adapter: postgresql
  encoding: unicode
  database: myapp_production
  pool: 5
  username: user
  password: password

Production.rb:

MyApp::Application.configure do
  config.cache_classes = true
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
  config.serve_static_assets = false
  config.assets.compress = true
  config.assets.compile = false
  config.assets.digest = true
end

Answer 1

你需要把预编译好的资源推送到git。

运行bundle exec rake assets:precompile后，再运行git add .，最后运行git push heroku master。

Answer 2

实际上你可以在Cedar上没有预编译的资源，参见以下内容:

"在运行时编译资源http://devcenter.heroku.com/articles/rails31_heroku_cedar

你需要在你的production.rb中设置以下内容:config.assets.compile = false

，以便在编译鼻涕虫的时候进行编译