通过具有多个状态的模型来建立友谊has_many' [英] Friendship has_many through model with multiple status'

问题描述

当前我的用户模型具有以下代码:

Currently my User model has the following code:

  has_many :notifications
  has_many :friendships
  has_many :friends, :through => :friendships, :conditions => { status: 'accepted' }
  has_many :requested_friends, :through => :friendships, :source => :friend, :conditions => { status: 'requested' }
  has_many :pending_friends, :through => :friendships, :source => :friend, :conditions => { status: 'pending' }

我的友谊模型如下:

  belongs_to :user
  belongs_to :friend, :class_name => "User"

  def self.request(user, friend)
    unless user == friend or Friendship.exists?(user_id: user, friend_id: friend)
      transaction do
        Friendship.create(:user => user, :friend => friend, :status => 'pending')
        Friendship.create(:user => friend, :friend => user, :status => 'requested')
      end
    else
      return "failed"
    end
  end

  def self.accept(user, friend)
    unless user == friend or Friendship.exists?(user_id: user, friend_id: friend)
      transaction do
        accepted_at = Time.now
        accept_one_side(user, friend, accepted_at)
        accept_one_side(friend, user, accepted_at)
      end
    else
      return "failed"
    end
  end

  def self.accept_one_side(user, friend, accepted_at)
    request = find_by_user_id_and_friend_id(user, friend)
    request.status = 'accepted'
    request.accepted_at = accepted_at
    request.save!
  end

但是，当我尝试运行黄瓜测试时，出现此错误:

When I try to run my cucumber tests, however, I am getting this error:

SQLite3::SQLException: no such column: users.status: SELECT "users".* FROM "users" INNER JOIN "friendships" ON "users"."id" = "friendships"."friend_id" WHERE "users"."status" = 'accepted' AND "friendships"."user_id" = ? (ActionView::Template::Error)

我认为这意味着它仅试图将属性状态为待处理"的用户包括在"pending_friends"中，而实际上应该包括属性状态为"pending"的属于友谊的用户

I think that this means it is trying to only include inside in for example pending_friends, users which have the attribute status = "pending", where it should actually be including users who belong to friendships which have attribute status = "pending"

这是对的吗?我将如何解决这个问题?

Is this right? How would I go about fixing this?

推荐答案

我已经更新为以下内容，并且可以正常工作:

I have updated to the following and this works:

  has_many :notifications
  has_many :friendships
  has_many :accepted_friendships, :class_name => "Friendship", :conditions => {status: 'accepted'}
  has_many :requested_friendships, :class_name => "Friendship", :conditions => {status: 'requested'}
  has_many :pending_friendships, :class_name => "Friendship", :conditions => {status: 'pending'}
  has_many :friends, :through => :accepted_friendships
  has_many :requested_friends, :through => :requested_friendships, :source => :friend
  has_many :pending_friends, :through => :pending_friendships, :source => :friend

但是，如果有人采用不同的方法而不必创建accepted_friendshis，requested_friendships和ending_friendships，我很想听听！

If anyone has a different approach without having to create accepted_friendshis, requested_friendships, and pending_friendships, however, I would love to hear it!

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