Question

我是自我参照关系的新手，我目前正在通过this教程来建立相互友谊模式。

我已经实现了FriendRequest模型并将其与用户模型相关联：

FriendRequest.rb

class FriendRequest < ApplicationRecord
  belongs_to :user
  belongs_to :friend, class_name: 'User'

User.rb

class User < ApplicationRecord
  has_many :friend_requests, dependent: :destroy
  has_many :pending_friends, through: :friend_requests, source: :friend

我在用户的个人资料页面上创建了一个链接，以创建新的好友请求：

<%= link_to 'Add Friend', friend_requests_path, method: :post %>

friend_requests_controller.rb

class FriendRequestsController < ApplicationController
  before_action :set_friend_request, except: [:index, :create]

  def create
    friend = User.find(params[:friend_id])
    @friend_request = current_user.friend_requests.new(friend: friend)

    if @friend_request.save
      render :show, status: :created, location: @friend_request
    else
      render json: @friend_request.errors, status: :unprocessable_entity
    end
  end

  private

  def set_friend_request
    @friend_request = FriendRequest.find(params[:id])
  end
end

但它会抛出ActiveRecord :: RecordNotFound Couldn't find User with 'id'=

针对该行提出具体问题：friend = User.find(params[:friend_id])

的routes.rb

 Rails.application.routes.draw do
   ...
  resources :users

  resources :user_sessions, only: [:new, :create, :destory]
  get 'login' => 'user_sessions#new'
  get 'logout' => 'user_sessions#destroy'

  get 'friends/index'
  get 'friends/destroy'
  resources :friend_requests

end

我已尝试在create操作和私有方法中更改参数，但我总是得到相同的ActiveRecord错误。

这是来自帖子请求的日志：

 Started POST "/friend_requests" for 127.0.0.1 at 2018-04-28 19:36:16 -0400
Processing by FriendRequestsController#create as HTML
  Parameters: {"authenticity_token"=>"BWRNktuMbSt6nNWDyloy+t7fwhyd8ITa/P4/7C0zmeCHyEPFQBVe9h2MpdCUC4Od4tjoC5Qg0x4Z6owf+29F9Q=="}
  User Load (1.6ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT ?  [["id", nil], ["LIMIT", 1]]
Completed 404 Not Found in 57ms (ActiveRecord: 4.4ms)



ActiveRecord::RecordNotFound (Couldn't find User with 'id'=):

app/controllers/friend_requests_controller.rb:5:in `create'

Answer 1

在控制器中，您期望params[:friend_id]，但不会在请求中传递它。

您的链接应该是这样的：

link_to 'Add Friend', friend_requests_path(friend_id: 123), method: :post

或者像这样：

button_to 'Add Friend', friend_requests_path, params: {friend_id: 123}

FriendRequestsControlle #show中的ActiveRecord :: RecordNotFound错误

1 个答案: