ruby-on-rails - (Rails)如何通过 id 查找并将用户保存到另一个具有用户 id 的模型的实例中？

Question

为这样一个令人困惑的标题道歉，

我有两个模型:

用户.rb

  class User < ApplicationRecord
     devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable
     has_many :friends
  end

friend .rb

  class Friend < ApplicationRecord
     belongs_to :user
  end

我想显示特定用户的所有好友列表。

配置文件 Controller :

class ProfilesController < ApplicationController

def show
end

def followed_users
   @friends = User.where(id: current_user.friends.friend_id)
end

end

followed_users.html.erb

<% @friends.each do |f| %>
   <%= f.email %>
<% end %>

但这不起作用，我收到以下错误:

NoMethodError in ProfilesController#followed_users
undefined method `friend_id' for #       <Friend::ActiveRecord_Associations_CollectionProxy:0x007fb960747a90> Did you mean? find_index

Answer 1

尝试跟随

def followed_users
   @friends = User.where(id: current_user.friends.pluck(:friend_id))
end