数据映射器关联 - 什么代码？

Question

我查看了DataMapper文档，但我很难看到如何做到这一点。我有两个表，我只想在User表中添加'handle'属性，作为Peeps表的一列 - 如下所示？

Answer 1

文档：http://datamapper.org/docs/associations.html自定义关联部分。

class User
  ...
  has n, :peeps, 'Peep',
    :parent_key => [ :handle ],      # local to this model (User)
    :child_key  => [ :user_handle ]  # in the remote model (Peep)
end

class Peep
  ...
  belongs_to :user, 'User',
    :parent_key => [ :handle ],      # in the remote model (Peep)
    :child_key  => [ :user_handle ]  # local to this model (User)
end