How would you model articles with references and citations in rails & ActiveRecord?

问题

An article has many articles that it refers to and many other articles can refer to it. Sometimes an article can refer to an article that also refers to it.

回答1:

I'd do it like this:

class Article < ActiveRecord::Base
  # mentions in other articles
  has_many :references, :foreign_key => 'referred_article_id'
  # articles that refer to it
  has_many :referrers, :through => :references, :foreign_key => 'referred_article_id'
  # articles it refers to
  has_many :referred_articles, :through => :references, :foreign_key => 'referrer_id'
end

class Reference < ActiveRecord::Base
  belongs_to :referrer, :class => Article
  belongs_to :referred_article, :class => Article
end

来源：https://stackoverflow.com/questions/499934/how-would-you-model-articles-with-references-and-citations-in-rails-activereco