Heroku 未加载 do_postgres 依赖项
开始使用 Heroku，但它似乎没有加载 dm-postgres-adapter 所需的依赖项 (do_postgres (~> 0.10.2))。
Gemfile 是这样的：
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'
Gemfile.lock 的相关部分如下所示：
dm-postgres-adapter (1.0.2)
dm-do-adapter (~> 1.0.2)
do_postgres (~> 0.10.2)
当推送到 Heroku 时，它似乎没有安装 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，事实上，Heroku 没有找到 gem 并且没有启动：
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第 21 行是这样的：
DataMapper.setup(:default, ENV['DATABASE_URL'] || 'sqlite3://' + Dir.pwd + '/database.db')
这是直接来自 Heroku 站点的代码： http://devcenter.heroku.com /articles/database#common_issues_migration_to_postgresql，位于“使用 DATABASE_URL 环境变量”下。该应用程序本地在 Sqlite 上运行，但 Heroku 使用 postgresql。我希望 DataMapper 能让转变变得轻而易举！
我已经尝试明确地包含
gem 'do_postgres', '~>0.10.2'
在 Gemfile 中，但没有成功。无论如何，这应该是没有必要的。也向 Heroku 支持提交了票证，但尚未收到他们的回复......
Getting started on Heroku, but it does not seem to be loading the necessary dependency (do_postgres (~> 0.10.2)) for dm-postgres-adapter.
The Gemfile is as such:
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'
With the relevant section of the Gemfile.lock looking as follows:
dm-postgres-adapter (1.0.2)
dm-do-adapter (~> 1.0.2)
do_postgres (~> 0.10.2)
When pushed to Heroku, it does not seem to install 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
And, indeed, Heroku does not find the gem and does not launch:
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 line 21 is this:
DataMapper.setup(:default, ENV['DATABASE_URL'] || 'sqlite3://' + Dir.pwd + '/database.db')
Which is code straight from the Heroku site: http://devcenter.heroku.com/articles/database#common_issues_migrating_to_postgresql , under "Using the DATABASE_URL Environment variable". The app runs on Sqlite locally, but Heroku uses postgresql. I was hoping DataMapper would make the transition a cinch!
I have tried explicitly including
gem 'do_postgres', '~>0.10.2'
in the Gemfile, to no avail. This should not be necessary, anyway. Submitted a ticket to Heroku support as well, but haven't heard back from them...
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评论（1）
Heroku 非常迅速地回复了我：
事实上，在删除 Gemfile.lock 之后，Heroku 正确安装了 do_postgres gem。我最初提交 Gemfile.lock 是因为 Heroku 界面推荐它（“很快就会需要 Gemfile.lock”），所以也许在某处发出一点警告，表明这会破坏与 Windows 的兼容性会很好。当然，跨平台的事情不是我决定的。 :)
Heroku got back to me, very promptly:
Indeed, after removing Gemfile.lock Heroku installed the do_postgres gem properly. I had originally committed Gemfile.lock because the Heroku interface recommended it, ("Gemfile.lock will soon be required"), so perhaps a little warning somewhere that this breaks compatibility with Windows would be nice. Of course, the cross-platform thing was not my decision. :)