我正在尝试修改一段代码:
property :email, String, :index => true, :null => false, :length => 1000
在模型定义中。我收到此错误:
ArgumentError: options :null are unknown
from /usr/lib/ruby/gems/1.8/gems/dm-core-0.10.2/lib/dm-core/property.rb:901:in `assert_valid_options'
from /usr/lib/ruby/gems/1.8/gems/dm-core-0.10.2/lib/dm-core/property.rb:811:in `initialize'
from /usr/lib/ruby/gems/1.8/gems/dm-core-0.10.2/lib/dm-core/model/property.rb:51:in `new'
from /usr/lib/ruby/gems/1.8/gems/dm-core-0.10.2/lib/dm-core/model/property.rb:51:in `property'
所以我认为我缺少一个 DataMapper 插件。