ruby-on-rails - 如何打印我的帖子和 friend 的帖子？

我有两个模型，用户和友谊，下面是它们的样子：

class User < ActiveRecord::Base
  has_many :posts
  has_many :friendships, :conditions => { :confirmed => true }
  has_many :friend_requests, :class_name => 'Friendship', :conditions => { :confirmed => false }
  has_many :friends, :through => :friendships
  has_many :friends_friendships, :through => :friends, :source => :friendships
  has_many :friends_of_friends, :through => :friends_friendships, :source => :friend
  has_many :friends_listings, :through => :friends, :source => :listings
  has_many :friends_posts, :through => :friends, :source => :posts
  ...
end

和

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

下面是我如何获取当前登录用户的帖子和他/她的朋友的帖子：

  @my_posts = current_user.posts.includes(:user)
  @friends_posts = current_user.friends_posts.includes(:user)

这很有效，但是我如何将我的帖子+我朋友的帖子加载到一个变量中，并在Facebook上显示出来呢换句话说，如何将这两个查询合并为一个查询？
谢谢

最佳答案

像这样的：

ids = current_user.friends.pluck(:id) << current_user.id
posts = Post.where(user_id: ids)

SELECT `posts`.* FROM `posts` WHERE `posts`.`user_id` IN (1, 2, 3, 6)

然后在视图中：

posts.each do |post|
  ....
end