Rails：has_many通过两个模型之间，has_many /属于同一模型

Question

我有一个有很多直通关系来定义用户已回答的问题。

如何为用户创建的问题建立关系？

通常情况下，您只需创建一个has_many和belongs_to用户和问题之间的关系，但由于我也做了has_many通过这将无法正常工作。

这是我到目前为止有：

型号：

Users 
Questions 
Answered_questions 

用户模型

has_many :answered_questions 
has_many :questions, :through => :answered_questions 

问题型号：

has_many :answered_questions 
has_many :users, :through => :answered_questions 

Answered_questions模式

belongs_to :question 
belongs_to :user 

编辑

我发现了这样的回答：https://stackoverflow.com/a/12637532/756623，害得我试试这个：

用户型号添加：

has_many :questions_created, :class_name => "Question", :inverse_of => :created_by 

问题型号添加：

belongs_to :created_by, :class_name => "User", :foreign_key => "created_by_id", :inverse_of => :questions_created 

我还添加了列created_by_id到现在...的user_id没有被添加到created_by_id列的问题表

。

我有什么问题？

Answer 1

我觉得这样的事情可能会解决你的问题：

# User 
has_many :answered_questions 
has_many :questions, :through => :answered_questions 
has_many :created_questions, class_name: Question, foreign_key: :author_id 

# Question 
has_many :answered_questions 
has_many :users, :through => :answered_questions 
belongs_to :author, class_name: User 

# Answered questions 
belongs_to :question 
belongs_to :user