Rails關聯 - 多種模型能力

Question

我有以下情況，用戶可以創建新聞快遞，也可以訂閱新聞快遞。有沒有更好的方法來區分這兩種能力與關聯，或者我可以將所有權置於訂閱模式中，如multiple has_many associations in Rails所示。有了這個解決方案，我該如何編寫新聞稿模型以獲得新聞通訊所有者和新聞通訊訂閱者。

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" 

現在，你可以通過做

newsletter.subscribers 
newsletter.creator