Rails ActiveRecord :: AssociationTypeMismatch

Question

Я пытаюсь создать notification, чтобы добавить user friend.Однако, когда я пытаюсь добавить друга к ошибке.

Модель дружбы

class Friendship < ApplicationRecord
  after_save :notification

  belongs_to :user
  belongs_to :friend, class_name: "User"
  has_many :notification

  private
  def all_friendships
    @all_friend = Friendship.order('created_at DESC').limit(1)
  end

  def notification
    all_friendships.each do |friend|
      Notification.create(recipient: friend.friend_id, actor: self.user, action: "add friend", notifiable: friend)
    end
  end
end

Контроллер дружбы

class FriendshipsController < ApplicationController
  before_action :set_friendships, only: [:show, :update, :destroy]

  def index; end  

  def create
    @friendship = current_user.friendships.build(friend_id: params[:friend_id],
                                                 accepted: false)
    if @friendship.save
      redirect_to current_user
    else
      redirect_to users_path
    end
  end

  def update
    @friendship.update_attributes(accepted: true)
    if @friendship.save
      redirect_to current_user
    else
      redirect_to users_path
    end
  end

  def destroy
    @friendship.destroy
    redirect_to current_user
  end

  private
    def set_friendships
        @friendship = Friendship.where(user_id: params[:id]).or(Friendship.where(friend_id: params[:id])).first
    end
end

Модель уведомления

class Notification < ApplicationRecord
  belongs_to :recipient, class_name: "User"
  belongs_to :actor, class_name: "User"
  belongs_to :notifiable, polymorphic: true

  scope :unread, -> { where(read_at: nil) }
end

Ошибка

ActiveRecord::AssociationTypeMismatch in FriendshipsController#create
User(#70140147575580) expected, got 2 which is an instance of Integer(#70140150807860)
Extracted source (around line #15):

  def notification
    all_friendships.each do |friend|
      Notification.create(recipient: friend.friend_id, actor: self.user, action: "add friend", notifiable: friend)
    end
  end
end

Answer 1

Вы устанавливаете friend_id (целое число) вместо пользовательской модели (получатель: friend.frien_id).Необходимо установить модель пользователя.Попробуйте:

def notification
    all_friendships.each do |friend|
      Notification.create(recipient: friend, actor: self.user, action: "add friend", notifiable: friend)
    end
  end

ОБНОВЛЕНИЕ: Неправильно вызывать переменную Friendship класса friend, так как friend должно быть User.В любом случае вот код:

def notification
    all_friendships.each do |friend|
      Notification.create(recipient: friend.friend, actor: self.user, action: "add friend", notifiable: friend)
    end
end