数据库配置未指定适配器（Sinatra+；Heroku+；Activerecord）

我（在Sinatra+ActiveRecord Heroku上）收到一个错误，

数据库配置没有指定适配器

从一些研究来看，这似乎是因为Heroku预计在装配过程中不会使用环境变量

我从列出数据库URL的db环境文件中删除了env vars，但仍然收到相同的错误

编辑：这在一天前db文件未更改的情况下也起作用，所以我不确定会出什么问题

2015-09-01T02:44:40.980448+00:00 app[web.1]: I, [2015-09-01T02:44:40.980313 #3]  INFO -- : Refreshing Gem list
2015-09-01T02:44:41.459544+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:171:in `spec': database configuration does not specify adapter (ActiveRecord::AdapterNotSpecified)
2015-09-01T02:44:41.459548+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/connection_handling.rb:50:in `establish_connection'
2015-09-01T02:44:41.459550+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-activerecord-2.0.8/lib/sinatra/activerecord.rb:43:in `database='
2015-09-01T02:44:41.459552+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:1216:in `set'
2015-09-01T02:44:41.459554+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-activerecord-2.0.8/lib/sinatra/activerecord.rb:35:in `database_file='
2015-09-01T02:44:41.459555+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:1216:in `set'
2015-09-01T02:44:41.459556+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-activerecord-2.0.8/lib/sinatra/activerecord.rb:19:in `registered'
2015-09-01T02:44:41.459560+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:1399:in `block in register'
2015-09-01T02:44:41.459562+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:1397:in `each'
2015-09-01T02:44:41.459563+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:1397:in `register'
2015-09-01T02:44:41.459565+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:1977:in `register'
2015-09-01T02:44:41.459566+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-1.4.6/lib/sinatra/base.rb:2038:in `register'
2015-09-01T02:44:41.459567+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-activerecord-2.0.8/lib/sinatra/activerecord.rb:54:in `<module:Sinatra>'
2015-09-01T02:44:41.459569+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/sinatra-activerecord-2.0.8/lib/sinatra/activerecord.rb:10:in `<top (required)>'
2015-09-01T02:44:41.459571+00:00 app[web.1]:    from /app/app.rb:2:in `require'
2015-09-01T02:44:41.459575+00:00 app[web.1]:    from /app/app.rb:2:in `<top (required)>'
2015-09-01T02:44:41.459576+00:00 app[web.1]:    from config.ru:2:in `require'
2015-09-01T02:44:41.459578+00:00 app[web.1]:    from config.ru:2:in `block in <main>'
2015-09-01T02:44:41.459587+00:00 app[web.1]:    from config.ru:1:in `<main>'
2015-09-01T02:44:41.459589+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.9.0/lib/unicorn.rb:48:in `eval'
2015-09-01T02:44:41.459590+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.9.0/lib/unicorn.rb:48:in `block in builder'
2015-09-01T02:44:41.459581+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
2015-09-01T02:44:41.459600+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/bin/unicorn:23:in `load'
2015-09-01T02:44:41.459582+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
2015-09-01T02:44:41.459601+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/bin/unicorn:23:in `<main>'
2015-09-01T02:44:41.459584+00:00 app[web.1]:    from config.ru:1:in `new'
2015-09-01T02:44:41.459593+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:768:in `build_app!'
2015-09-01T02:44:41.459595+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:137:in `start'
2015-09-01T02:44:41.459598+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.9.0/bin/unicorn:126:in `<top (required)>'
2015-09-01T02:44:41.459592+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:768:in `call'
2015-09-01T02:44:42.358161+00:00 heroku[web.1]: State changed from starting to crashed
2015-09-01T02:44:42.351187+00:00 heroku[web.1]: Process exited with status 1

这是database.yml文件：

development:
  adapter: postgresql
  database: development
  username: <%= ENV['PG_USER'] %>
  password: <%= ENV['PG_PASS'] %>
  host: localhost

test:
  adapter: postgresql
  database: test
  username: <%= ENV['PG_USER'] %>
  password: <%= ENV['PG_PASS'] %>
  host: localhost

开发：
适配器：postgresql
数据库：开发
用户名：
密码：
主机：本地主机
测试：
适配器：postgresql
数据库：测试
用户名：
密码：
主机：本地主机

编辑2：看起来伤害来自四次提交中的一次。下面我们来看看其中一个发生了什么变化：（编辑3:？）
您不需要像这样进行URL解析。几年前，我修补了
ActiveRecord
，默认使用
ENV['DATABASE\u URL']
（如果可用）。因此，如果设置了它（如果您安装了
Heroku postgresql
，它就在Heroku上），那么只需调用
ActiveRecord即可。建立连接
，它就会工作：
我今天遇到了同样的问题，并联系了Heroku支持部门寻求帮助

他们向我介绍了他们的Ruby构建包的最新变化，请参见：

我更新了database.yml文件以反映更改，并引用了用于生产的数据库URL，我的应用程序正在重新部署

production:
  url: <%= ENV['DATABASE_URL'] %>

生产：
网址：
显示数据库配置？您可能希望在该文件中隐藏用户/密码/主机信息。为了更安全是的，搞定了。我们找到了上面链接的断开的提交。我们认为错误来自于在错误的rspec测试中使用保留字“include”（在文件的末尾）。昨天在部署了一个微小的代码更改后，我遇到了完全相同的问题。我使用heroku回滚重置为以前的版本。也许是Heroku的问题？我这次退回了--看起来不是问题。你知道还有什么会导致这个错误吗？很好。你是个圣人，多谢了！这相当具有破坏性，应该很容易更新Sinatra/ActiveRecord应用程序的ruby所有者。
production:
  url: <%= ENV['DATABASE_URL'] %>