在 mongoid 中关联同一个模型两次答案

【问题标题】：Associates the same model twice in mongoid在 mongoid 中关联同一个模型两次
【发布时间】：2017-02-28 04:57:58
【问题描述】：

我有两个班级Intern::Question 和Intern::Answer，标准关联看起来像：

class Intern::Question
  has_many :intern_answers, class_name: 'Intern::Answer'
end

class Intern::Answer
  belongs_to :intern_question, class_name: 'Intern::Question'
end

现在我想引用两次答案belongs_to问题，答案可以存储父问题和下一个问题，例如：

class Intern::Question
  has_many :intern_answers, class_name: 'Intern::Answer'
  has_many :node_for_answers, class_name: 'Intern::Answer'
end

class Intern::Answer
  belongs_to :intern_question, foreign_key: :intern_question_id, class_name: 'Intern::Question'
  belongs_to :next_question, foreign_key: :next_question_id, class_name: 'Intern::Question'
end

但我已经尝试过并收到此错误：

Mongoid::Errors::AmbiguousRelationship

【问题讨论】：

@muistooshort 抱歉打错了..

标签： ruby-on-rails ruby-on-rails-4 mongoid

【解决方案1】：

找到解决方案here，使用inverse_of

class Intern::Question
  has_many :intern_answers, class_name: 'Intern::Answer', inverse_of: :intern_question
  has_many :node_for_answers, class_name: 'Intern::Answer', inverse_of: :next_question
end

class Intern::Answer
  belongs_to :intern_question, foreign_key: :intern_question_id, class_name: 'Intern::Question', inverse_of: :intern_answers
  belongs_to :next_question, foreign_key: :next_question_id, class_name: 'Intern::Question', inverse_of: :node_for_answers
end

【讨论】：