Ruby on rails 如何使用ActiveRecord关联指定rails中模型之间的多个关系

假设有两种模型：用户和帖子，我想跟踪谁读了哪个帖子，谁写了哪个帖子，哪个用户最喜欢哪个帖子等等。然后我提出了以下解决方案：

class User < ActiveRecord::Base
  has_many :writings
  has_many :posts, :through => :writings
  has_many :readings
  has_many :posts, :through => :readings
  #..
end

class Post < ActiveRecord::Base
  has_many :writings
  has_many :posts, :through => :writings
  #...
end

---

返回的数组包含写入和读取的内务管理信息。我怎样才能解决这个问题。

你想要这样的东西：

class User < ActiveRecord::Base
  has_many :writings
  has_many :posts, :through => :writings
  has_many :readings
  has_many :read_posts, :through => :readings, :class_name => "Post"
  #..
end

class User < ActiveRecord::Base
  has_many :writings
  has_many :posts, :through => :writings
  has_many :readings
  has_many :read_posts, :through => :readings, :class_name => "Post"
  #..
end

@user.posts # =>  posts that a user has written via writings
@user.read_posts # => posts that a user has read via readings