Ruby DataMapper说TypeError：没有从nil到integer的隐式转换

我有一个非常简单的表，几乎是一个键/值存储，类似

class Device
    include DataMapper::Resource
    property :token,    Text, :key => true
end

当然，我在定义后调用

DataMapper.finalize

，因为我使用的是Sinatra

当我创建一个新设备时，像这样

Device.create(:token => "Foo Bar")

我得到了所有这些巨大的垃圾

~ (0.000063) SET sql_auto_is_null = 0
~ no implicit conversion from nil to integer
TypeError: no implicit conversion from nil to integer
    from /Library/Ruby/Gems/2.0.0/gems/data_objects-0.10.14/lib/data_objects/quoting.rb:12:in `quote_string'
    from /Library/Ruby/Gems/2.0.0/gems/data_objects-0.10.14/lib/data_objects/quoting.rb:12:in `quote_value'
    from /Library/Ruby/Gems/2.0.0/gems/data_objects-0.10.14/lib/data_objects/command.rb:69:in `block in escape_sql'
    from /Library/Ruby/Gems/2.0.0/gems/data_objects-0.10.14/lib/data_objects/command.rb:62:in `gsub!'
    from /Library/Ruby/Gems/2.0.0/gems/data_objects-0.10.14/lib/data_objects/command.rb:62:in `escape_sql'
    from /Library/Ruby/Gems/2.0.0/gems/dm-do-adapter-1.2.0/lib/dm-do-adapter/adapter.rb:114:in `execute_non_query'
    from /Library/Ruby/Gems/2.0.0/gems/dm-do-adapter-1.2.0/lib/dm-do-adapter/adapter.rb:114:in `block (2 levels) in create'
    from /Library/Ruby/Gems/2.0.0/gems/dm-do-adapter-1.2.0/lib/dm-do-adapter/adapter.rb:276:in `with_connection'
    from /Library/Ruby/Gems/2.0.0/gems/dm-do-adapter-1.2.0/lib/dm-do-adapter/adapter.rb:113:in `block in create'
    from /Library/Ruby/Gems/2.0.0/gems/dm-do-adapter-1.2.0/lib/dm-do-adapter/adapter.rb:85:in `each'
    from /Library/Ruby/Gems/2.0.0/gems/dm-do-adapter-1.2.0/lib/dm-do-adapter/adapter.rb:85:in `create'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/repository.rb:146:in `create'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource/persistence_state/transient.rb:74:in `create_resource'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource/persistence_state/transient.rb:25:in `commit'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:963:in `_persist'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:977:in `block in create_with_hooks'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:974:in `catch'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:974:in `create_with_hooks'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:1028:in `save_self'
    from /Library/Ruby/Gems/2.0.0/gems/dm-validations-1.2.0/lib/dm-validations.rb:54:in `save_self'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:1013:in `block in _save'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:1229:in `run_once'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:1012:in `_save'
    from /Library/Ruby/Gems/2.0.0/gems/dm-core-1.2.1/lib/dm-core/resource.rb:412:in `save'
    from /Library/Ruby/Gems/2.0.0/gems/dm-validations-1.2.0/lib/dm-validations.rb:40:in `block in save'
    from /Library/Ruby/Gems/2.0.0/gems/dm-validations-1.2.0/lib/dm-validations/context.rb:16:in `in_context'
    from /Library/Ruby/Gems/2.0.0/gems/dm-validations-1.2.0/lib/dm-validations.rb:40:in `save'
    from /Library/Ruby/Gems/2.0.0/gems/dm-validations-1.2.0/lib/dm-validations.rb:130:in `create'
    from (irb):19
    from /usr/bin/irb:12

当然，当我在Sinatra中运行完全相同的代码时，也会发生类似的事情。我正在运行Ruby 2.0，以防不清楚

有什么线索吗

---

编辑：由于时间限制，我已经搬到了Rails，但我喜欢Sinatra，我仍然想让它发挥作用，所以如果有人有想法，我仍然非常欢迎。

我只是花了几个小时在Ubuntu 14.04上努力克服这个确切的问题。这似乎完全是无稽之谈，试图在data objects gem中调试问题是徒劳的

我的解决方案是：卸载

libmariadbclient dev

，安装

libmysqlclient dev

，重新部署，它终于工作了

---

希望这能有所帮助。

我也遇到了完全相同的问题，而且还使用了Ruby 2.0（默认的Ruby on OS X Mavericks）。升级到2.1.2修复了该问题

如果您实际使用的是OS X，我建议您使用安装via

---

您是否运行了

DataMapper.auto_migrate？如果不运行它，请告诉我。我的数据存储中已经有一个模式，没有必要运行它，但只是为了好玩，我运行了它（就在finalize之后，因为在Sinatra应用程序中，你还应该在哪里运行它？），我得到了几乎完全相同的转储（除了一些行号之类的内容）。奇怪。它在我的DataMapper+Sqlite+Ruby2.0设置中运行得非常好
Device.all#=>[#]
@kiddorails，事实上我可以毫无问题地获取所有
Device
s，我只是无法让它创建新的。@Morpheu5上面的列表（在我的输出中）是由
Device.create（：token=>“Foo Bar”）
本身创建的。
\curl -sSL https://get.rvm.io | bash -s stable --ruby