ruby-on-rails – 在rails中为自联接表添加计数器缓存

概述我试图在自联接关联中的列上添加计数器缓存. 我有两个型号用户和以下.用户拥有关注者和关注者,他们来自用户表本身. User.rb has_many :followings has_many :followers, :through => :followings has_many :followees, :through => :followingsFollowing.rbcl 我试图在自联接关联中的列上添加计数器缓存.
我有两个型号用户和以下.用户拥有关注者和关注者,他们来自用户表本身.

User.rb  has_many :followings  has_many :followers,:through => :followings  has_many :followees,:through => :followingsFollowing.rbclass Following < ActiveRecord::Base  attr_accessible :followee_ID,:follower_ID  belongs_to :follower,:class_name => "User"   belongs_to :followee,:class_name => "User"end

现在我想在追随者和追随者上添加计数器缓存.我在用户表中有followers_count和followees_count列.

我试过了

belongs_to :follower,:class_name => "User",:counter_cache => true

但是这不会返回用户表中的任何数据.
任何帮助,将不胜感激.

解决方法 很久以前,但是

User.rb

class User < ActiveRecord::Base  has_many :followings_as_follower,class_name: 'Following',foreign_key: 'follower_ID',dependent: :destroy  has_many :followings_as_followee,foreign_key: 'followee_ID',dependent: :destroy  has_many :followers,through: :followings_as_followee,source: :follower  has_many :followees,through: :followings_as_follower,source: :followee  def follow?(user)    followees.reload.include? user  end  def follow(user)    return if follow?(user)    followings_as_follower.create(followee: user)  end  def unfollow(user)    return unless follow?(user)    followings_as_follower.where(followee: user).first.destroy  endend

Following.rb

class Following < ActiveRecord::Base  belongs_to :follower,class_name: 'User',counter_cache: :followees_count  belongs_to :followee,counter_cache: :followers_count  valIDates :follower,presence: true  valIDates :followee,uniqueness: { scope: [:follower,:followee] }end

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