ruby-on-rails - 你如何在 rails 中为 "Likes"建模？

Question

我有 3 个模型:用户、对象、喜欢

目前，我有模型:一个用户有很多对象。我如何进行建模:

1) 一个用户可以喜欢很多对象

2) 一个对象可以有很多点赞(来自不同的用户)

所以我希望能够做这样的事情:

User.likes = 用户喜欢的对象列表

Objects.liked_by = 对象喜欢的用户列表

下面的模型肯定是错误的...

class User < ActiveRecord::Base
  has_many :objects
  has_many :objects, :through => :likes
end

class Likes < ActiveRecord::Base
  belongs_to :user
  belongs_to :object
end

class Objects < ActiveRecord::Base
  belongs_to :users
  has_many :users, :through => :likes    
end

Answer 1

为了进一步阐述我对 Brandon Tilley 的回答的评论，我建议如下:

class User < ActiveRecord::Base
  # your original association
  has_many :things

  # the like associations
  has_many :likes
  has_many :liked_things, :through => :likes, :source => :thing
end

class Like < ActiveRecord::Base
  belongs_to :user
  belongs_to :thing
end

class Thing < ActiveRecord::Base
  # your original association
  belongs_to :user

  # the like associations
  has_many :likes
  has_many :liking_users, :through => :likes, :source => :user
end