Question

我有作者实体，其属于用户。用户has_many帖子。请告知我如何在用户的作者实体上显示recent_posts。

class User < ActiveRecord::Base
  has_many :posts, :foreign_key => "author_id"
end

class Post < ActiveRecord::Base
  attr_accessible :title, :content
  belongs_to :author, :class_name => "User"
end

class Author < ActiveRecord::Base
  belongs_to :user
  has_many :recent_posts, :through => :user,
          :class_name => "Post",
          :limit => 3,
          :order => "updated_at desc"
end

应该如何使用recent_post？原始的SQL？

Answer 1

您需要:source has_many选项，用于指定其他模型上的关联，如下所示：

has_many :recent_posts, :through => :user, :source => :posts, :limit => 3, :order => 'updated_at desc'

AR在父类中加入了类

1 个答案: