型号: class Country
include DataMapper::Resource
property :id, Serial
property :name, String
property :continent, String
end
我试图通过name属性做一个查询: Country.find(:name => "value") 但它一直返
我有一个庞大而复杂的用户模型,它看起来是这样的: class User
class Link
include DataMapper::Resource
property :id, Serial, :key => false
belongs_to :follower, :model => 'User', :key => true
belongs_
我的屈应用是否显示错误需要使用的DataMapper上乘客运行领域时声明和Ruby 1.8 错误:未定义局部变量或方法`需要”的人:类 class Person
include DataMapper::Resource
property :id, Serial
property :salutation, String
property :first_name, String , requi