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Heroku入门，但它似乎并没有加载dm-postgres-adapter所需的依赖项（do_postgres（〜> 0.10.2））。Heroku not Loading do_postgres依赖关系
的Gemfile中是这样：
source :gemcutter
gem 'dm-postgres-adapter', '1.0.2'
gem 'dm-sqlite-adapter', '1.0.2'
gem 'sinatra', '1.1.0'
gem 'mustache', '0.9'
gem 'datamapper', '1.0.2'
gem 'json', '1.5.1'
随着的Gemfile.lock的看上去相关的部分如下：
dm-postgres-adapter (1.0.2)
dm-do-adapter (~> 1.0.2)
do_postgres (~> 0.10.2)
当被推到Heroku的，它似乎并没有安装do_postgres：
-----> Heroku receiving push
-----> Sinatra app detected
-----> Gemfile detected, running Bundler version 1.0.7
Unresolved dependencies detected; Installing...
Using --without development:test
Fetching source index for http://rubygems.org/
Installing addressable (2.2.4)
Installing data_objects (0.10.3)
Installing extlib (0.9.15)
Installing dm-core (1.0.2)
Installing dm-aggregates (1.0.2)
Installing dm-migrations (1.0.2)
Installing dm-constraints (1.0.2)
Installing fastercsv (1.5.4)
Installing json_pure (1.5.1)
Installing dm-serializer (1.0.2)
Installing dm-timestamps (1.0.2)
Installing dm-transactions (1.0.2)
Installing stringex (1.1.0)
Installing uuidtools (2.1.2)
Installing dm-types (1.0.2)
Installing dm-validations (1.0.2)
Installing datamapper (1.0.2)
Installing dm-do-adapter (1.0.2)
Installing dm-postgres-adapter (1.0.2)
Installing dm-sqlite-adapter (1.0.2)
Installing mustache (0.9.0)
Installing rack (1.2.1)
Installing tilt (1.2.2)
Installing sinatra (1.1.0)
Using bundler (1.0.7)
Your bundle is complete! It was installed into ./.bundle/gems/
Compiled slug size is 1.7MB
-----> Launching... done
而且的确，Heroku没有找到宝石并且不会启动：
2011-03-07T10:48:31-08:00 heroku[slugc]: Slug compilation finished
2011-03-07T10:48:35-08:00 app[web.1]: /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:779:in `report_activate_error': Could not find RubyGem do_postgres (~> 0.10.2) (Gem::LoadError)
2011-03-07T10:48:35-08:00 app[web.1]: from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:214:in `activate'
2011-03-07T10:48:35-08:00 app[web.1]: from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:249:in `activate'
2011-03-07T10:48:35-08:00 app[web.1]: from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:248:in `activate'
2011-03-07T10:48:35-08:00 app[web.1]: from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems.rb:248:in `each'
2011-03-07T10:48:35-08:00 app[web.1]: from /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:35:in `require'
2011-03-07T10:48:35-08:00 app[web.1]: from /app/04eca654-0ab6-43de-aae1-1dbed7bef1a1/home/.bundle/gems/ruby/1.8/gems/dm-core-1.0.2/lib/dm-core/adapters.rb:163:in `load_adapter'
2011-03-07T10:48:35-08:00 app[web.1]: from /app/04eca654-0ab6-43de-aae1-1dbed7bef1a1/home/.bundle/gems/ruby/1.8/gems/dm-core-1.0.2/lib/dm-core/adapters.rb:133:in `adapter_class'
2011-03-07T10:48:35-08:00 app[web.1]: from /app/04eca654-0ab6-43de-aae1-1dbed7bef1a1/home/.bundle/gems/ruby/1.8/gems/dm-core-1.0.2/lib/dm-core/adapters.rb:13:in `new'
2011-03-07T10:48:35-08:00 app[web.1]: from /app/04eca654-0ab6-43de-aae1-1dbed7bef1a1/home/.bundle/gems/ruby/1.8/gems/dm-core-1.0.2/lib/dm-core.rb:266:in `setup'
2011-03-07T10:48:35-08:00 app[web.1]: from ./lib/database.rb:21:in `initialize'
database.rb线21是这样的：
DataMapper.setup(:default, ENV['DATABASE_URL'] || 'sqlite3://' + Dir.pwd + '/database.db')
哪个代码直接从Heroku的网站：http://devcenter.heroku.com/articles/database#common_issues_migrating_to_postgresql， “使用DATABASE_URL环境变量” 下。该应用程序在本地运行Sqlite，但Heroku使用postgresql。我希望DataMapper能够实现转换！
我试图明确包括
gem 'do_postgres', '~>0.10.2'
，但无济于事。无论如何，这不应该是必要的。提交工单到Heroku的支持一样好，但还没有听说过他们的回复......