扶手：查找所有相关对象父对象 [英] Rails: Finding all associated objects to a parent object

问题描述

我已经创造了铁轨一个复杂的对象与原则父对象恢复它为每个部分（objective_section，contact_section等）的一些子对象，是有办法，我可以获取所有相关对象的父对象恢复？

I have created a complex object in rails with a principle parent object "Resume" it has a number of child objects for each section("objective_section", "contact_section", etc), is there a way I can fetch all associated objects to the parent object Resume?

推荐答案

如果通过抓取你的意思是从数据库负载都在同一个查询，则肯定的：

If by fetch you mean load from the database all in one query, then sure:

Resume.first(:include => [:objective_sections, :contact_sections]) # etc...

如果这是一个常见的​​模式，你要干的事情了没有太多的精力，你可以在你的模型扔到named_scope这样的：

If this is a common pattern and you want to DRY things up without much effort, you can throw this into a named_scope in your model:

class Resume < ActiveRecord::Base
  has_many :objective_sections
  has_many :contact_sections

  named_scope :with_sections, :include => [:objective_sections, :contact_sections]
end

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