数据映射器关联-什么代码？

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问题描述

ive浏览了DataMapper文档，但正在努力查看如何执行此操作。我有两个表，我只是希望将User表的'handle'属性添加为Peeps表的一列-如下所示？

ive looked through the DataMapper docs but am struggling to see how to do this. I have two tables and I simply wish to add the 'handle' attribute from the User table, as a column to the Peeps table - as per below?

推荐答案

文档：自定义关联部分。

Doc: http://datamapper.org/docs/associations.html Customizing Associations section.

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

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