ruby - Data-Mapper 在乘客和红宝石 1.8 下

Question

使用在乘客和 ruby​​ 1.8 上运行的数据映射器在字段上声明必需时，我的 sinatra 应用程序显示错误

错误：Person:Class 的未定义局部变量或方法“必需”

class Person
include DataMapper::Resource
property :id, Serial
property :salutation, String 
property :first_name, String , required => true 
property :last_name, String , required => true 
property :email, String , required => true, :format => :email_address 
property :phone, String , required => true
property :dob, String 
property :no_of_guests, String , required => true
property :attending, String, required => true

property :created_at, DateTime
end

这是 datamapper 和 ruby​​ 1.8 的问题，还是乘客的问题，还是我标记所需属性的方式？

Answer 1

required必须是符号 ( :required)：

class Person
include DataMapper::Resource
property :id, Serial
property :salutation, String 
property :first_name, String , :required => true 
property :last_name, String , :required => true 
property :email, String , :required => true, :format => :email_address 
property :phone, String , :required => true
property :dob, String 
property :no_of_guests, String , :required => true
property :attending, String, :required => true

property :created_at, DateTime
end