Rails 请问 self-join 的问题。实现 twitter 的 follower 和关注

gazeldx · December 19, 2011 · Last by suupic replied at February 04, 2012 · 3835 hits

用户表 users 我设计了一个关联表 follows

 create_table "follows", :id => false, :force => true do |t|
    t.integer  "me"
    t.integer  "you"
    t.datetime "created_at"
end

请问“这里”怎么写？

class User < ActiveRecord::Base
 #这里
end
class Follow < ActiveRecord::Base
 #这里 
end

belongs_to :xxx
has_many :xxx

2 likes

huacnlee #1 December 19, 2011

用 has_many through http://guides.rubyonrails.org/association_basics.html#the-has_many-through-association

此外，可以参见 acts_as_follower 的设计：

https://github.com/tcocca/acts_as_follower

Unknow user #2 December 19, 2011

看这个什么都知道了 http://ruby.railstutorial.org/chapters/following-users#top

suupic #3 December 19, 2011

我用 mongoid 的写法

has_and_belongs_to_many :following, 
                        :class_name => 'User', 
                        :inverse_of => :followers
has_and_belongs_to_many :followers, 
                        :class_name => 'User', 
                        :inverse_of => :following

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