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我最近分叉了https://github.com/fortuity/rails3-mongoid-omniauth并试图在heroku.com上运行。这是一个应用程序，演示如何在heroku上使用MongoDB（通过MongoHQ）以及OAuth身份验证。我分叉的代码快照是https://github.com/jgodse/rails3-mongoid-omniauth/tree/8cb490e660ab1d2d1df0f68312584563f0fd223aHeroku：MongoHQ：连接问题
当我调整了mongoid.yml以包含URI参数后，删除其他参数为生产（即heroku）环境，然后在heroku.com上启动应用程序，我得到以下日志来自heroku日志）。
←[36m2011-05-11T19:00:36+00:00 heroku[web.1]:←[0m Starting process with command: thin -p 41913 -e production -R /home/heroku_rack/heroku.ru start
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m /app/.bundle/gems/ruby/1.9.1/gems/mongo-1.3.0/lib/mongo/connection.rb:494:in connect': Failed to connect to a master node at localhost:27017 (Mongo::ConnectionFailure)
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongo-1.3.0/lib/mongo/connection.rb:632:insetup'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongo-1.3.0/lib/mongo/connection.rb:101:in initialize'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongo-1.3.0/lib/mongo/connection.rb:152:innew'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongo-1.3.0/lib/mongo/connection.rb:152:in from_uri'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongoid-2.0.1/lib/mongoid/config/database.rb:86:inmaster'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongoid-2.0.1/lib/mongoid/config/database.rb:19:in configure'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongoid-2.0.1/lib/mongoid/config.rb:319:inconfigure_databases'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from /app/.bundle/gems/ruby/1.9.1/gems/mongoid-2.0.1/lib/mongoid/config.rb:114:in from_hash'
←[36m2011-05-11T19:00:42+00:00 app[web.1]:←[0m from (eval):2:infrom_hash'
←[36m2011-05-11T19:00:42+00:00 heroku[web.1]:←[0m Process exited
←[36m2011-05-11T12:00:43-07:00 heroku[web.1]:←[0m State changed from starting to crashed
我的Heroku的环境看起来像这样（有一些关键的信息xxxx'ed出）：
$ heroku info
=== jgodse-omniauth-mongoid
Web URL: http://jgodse-omniauth-mongoid.heroku.com/
Git Repo: [email protected]:jgodse-omniauth-mongoid.git
Dynos: 1
Workers: 0
Repo size: 5M
Slug size: 5M
Stack: bamboo-mri-1.9.2
Data size: (empty)
Addons: Basic Logging, MongoHQ MongoHQ Free, Shared Database 5MB
Owner: xxxxxxxx
[email protected] ~/rapps/rails3-mongoid-omniauth (master)
$ heroku config --long
BUNDLE_WITHOUT => development:test
DATABASE_URL => postgres://xxxxxxxxxxxx
LANG => en_US.UTF-8
MONGOHQ_URL => mongodb://heroku:xxxxxxxxxxxxxxxxxxxxxxxxxxxx.mongohq.com:27098/app527030
RACK_ENV => production
SHARED_DATABASE_URL => postgres://xxxxxxx xxxxxx
Heroku的日志说，它仍在试图连接到本地主机：27017即使我删除本地主机引用从mongoid.yml。还有什么我必须做的强制它连接到我的MONGOHQ_URL？