在 Rails 中创建友谊模型协会

Question

问题：@user.friends 不起作用。它返回 2 条记录，应该是 4 条。

我有以下模型：

class User < ActiveRecord::Base
  has_many :friendships
  has_many :friends, 
    :through => :friendships,
    :conditions => "status = 'accepted'", 
    :order => :fname
  has_many :requested_friends, 
    :through => :friendships, 
    :source => :friend,
    :conditions => "status = 'requested'"
  has_many :pending_friends, 
    :through => :friendships, 
    :source => :friend,
    :conditions => "status = 'pending'"

class Friendship < ActiveRecord::Base
  belongs_to :user
  belongs_to :friend, :class_name => "User", :foreign_key => "friend_id"

出于某种原因。 <%[电子邮件受保护]%> 没有返回用户的所有好友。

示例数据：

> @user.friendships.all.length
=> 4
> @user.friendships
=> [#<Friendship id: 20, user_id: 11, friend_id: 20, status: "accepted", created_at: "2011-12-22 12:59:22", updated_at: "2011-12-22 17:02:54">, #<Friendship id: 8, user_id: 11, friend_id: 12, status: "accepted", created_at: "2011-12-22 06:29:02", updated_at: "2011-12-22 07:41:24">, #<Friendship id: 3, user_id: 11, friend_id: 1, status: "approved", created_at: "2011-12-22 05:48:29", updated_at: "2011-12-22 06:22:09">, #<Friendship id: 1, user_id: 11, friend_id: 641, status: "approved", created_at: "2011-12-22 04:47:19", updated_at: "2011-12-22 04:47:19">]
> @user.friends.length
=> 2

@user.friends.length 应为 4，因为上面的数据显示所有状态均为“已接受”。知道我在上面列出的模型关联中搞砸了什么吗？

谢谢你！

Answer 1

其中两个好友的状态为“已批准”，两个好友的状态为“已接受”。这就是为什么它根据您的条件仅返回两个接受友谊。