Rails关联 - 多种模型能力

Question

我有以下情况，用户可以创建新闻快递，也可以订阅新闻快递。有没有更好的方法来区分这两种能力与关联，或者我可以将所有权置于订阅模式中，如multiple has_many associations in Rails所示。有了这个解决方案，我该如何编写新闻稿模型以获得新闻通讯所有者和新闻通讯订阅者。

Newsletter Model 
    # fields: id, user_id 
    has_many :subscriptions 
    has_many :users, through: :subscriptions 
    belongs_to :user *i.e. created by a single user* 

Subscription Model 
    # fields: user_id, newsletter_id 
    belongs_to :newsletter 
    belongs_to :user 

User Model 
    # fields: id 
    has_many :subscriptions 
    has_many :newsletters, through: :subscriptions 
    has_many :newsletters *i.e. created many newsletters* 
    has_many :created_newsletters, :through => :subscriptions, *old answer* 
      :source => :newsletter, 
      :conditions => ["newsletter.creator = ?", true] 

Answer 1

Newsletter Model 
    has_many :subscriptions 
    has_many :subscribers, through: :subscriptions, source: :user 
    belongs_to :creator, class_name: "User", foreign_key: "user_id" 

Subscription Model 
    # fields: user_id, newsletter_id 
    belongs_to :newsletter 
    belongs_to :user 

User Model 
    # fields: id 
    has_many :subscriptions 
    has_many :subscribed_newsletters, through: :subscriptions, source: :newsletter 
    has_many :created_newsletters, class_name: "Newsletter", foreign_key: "user_id" 

现在，你可以通过做

newsletter.subscribers 
newsletter.creator