Railsで投稿を「いいね」したユーザー一覧を表示させたいが、エラーが発生する。

前提・実現したいこと

Railsで投稿を「いいね」したユーザー一覧を表示させたいのですが、エラーが発生してから先に進めません。
ログイン機能及び複数のユーザー登録、「いいね」機能は既に実装してあります（各投稿にも複数のユーザーが「いいね」を既にしている状態です）。
どなたかお知恵を拝借頂けると幸いです。

発生している問題・エラーメッセージ

NoMethodError in Posts#show
Showing C:/hoge/app/views/users/_likes.html.erb where line #1 raised:

undefined method `each' for nil:NilClass
Extracted source (around line #1):
              
<% @likes.each do |like| %>
  <% user = User.find_by(id: like.user_id) %>
  <div class="users-index-item">
    <div class="user-left">
      <img src="<%= "/user_images/#{user.image_name}" %>">
    </div>

該当のソースコード(routes.rb)

ruby
1Rails.application.routes.draw do
2  post "likes/:post_id/create" => "likes#create"
3  post "likes/:post_id/destroy" => "likes#destroy"
4
5  get "login" => "users#login_form"
6  post "login" => "users#login"
7  post "logout" => "users#logout"
8
9  post "users/:id/update" => "users#update"
10  get "users/:id/edit" => "users#edit"
11  post "users/create" => "users#create"
12  get "signup" => "users#new"
13  get 'users/index' => 'users#index'
14  get "users/:id" => "users#show"
15  get "users/:id/likes" => "users#likes"
16  get "/" => "users#top"
17  post "users/:id/destroy" => "users#destroy"
18
19  get 'posts/index'=> 'posts#index'
20  get "posts/new" => "posts#new"
21  get "posts/:id" => "posts#show"
22  post "posts/create" => "posts#create"
23  get "posts/:id/edit" => "posts#edit"
24  post "posts/:id/update" => "posts#update"
25  post "posts/:id/destroy" => "posts#destroy"
26  get "posts/search" => "posts#search"
27  get "posts/:id/likes" => "posts#likes"
28
29  get 'about/about'
30  get 'home/top' => 'home#top'
31  get 'top' => 'home#top'
32  get 'about' => 'about#about'
33
34  resources :users do
35    member do
36      get :following, :followers, :users_tweets
37    end
38  end
39  resources :relationships, only: [:create, :destroy]
40
41  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
42end

該当のソースコード(posts_controller.rb)

ruby
1class PostsController < ApplicationController
2  before_action :authenticate_user
3  before_action :ensure_correct_user, {only: [:edit, :update, :destroy]}
4
5  def index
6    @posts = Post.all.order(created_at: :desc)
7  end
8
9  def show
10    @post = Post.find_by(id: params[:id])
11    @user = @post.user
12    @likes_count = Like.where(post_id: @post.id).count
13  end
14
15  def new
16    @post = Post.new
17  end
18
19  def create
20    @post = Post.new(
21      title: params[:title],
22      level: params[:level],
23      maximum: params[:maximum],
24      message: params[:message],
25      user_id: @current_user.id
26    )
27    if @post.save
28      flash[:notice] = "投稿を作成しました"
29      redirect_to("/posts/index")
30    else
31      render("posts/new")
32    end
33  end
34
35  def edit
36    @post = Post.find_by(id: params[:id])
37  end
38
39  def update
40    @post = Post.find_by(id: params[:id])
41    @post.title = params[:title]
42    @post.level = params[:level]
43    @post.maximum = params[:maximum]
44    @post.message = params[:message]
45    if @post.save
46      flash[:notice] = "投稿を編集しました"
47      redirect_to("/posts/index")
48    else
49      render("posts/edit")
50    end
51  end
52
53  def destroy
54    @post = Post.find_by(id: params[:id])
55    @post.destroy
56    flash[:notice] = "投稿を削除しました"
57    redirect_to("/posts/index")
58  end
59
60  def ensure_correct_user
61    @post = Post.find_by(id: params[:id])
62    if @post.user_id != @current_user.id
63      flash[:notice] = "権限がありません"
64      redirect_to("/posts/index")
65    end
66  end
67
68  def search
69    #Viewのformで取得したパラメータをモデルに渡す
70    @posts = Post.search(params[:search])
71  end
72
73  def likes
74    @post = Post.find_by(id: params[:id])
75    @likes = Like.where(post_id: @post.id)
76  end
77end

該当のソースコード(post#show.html.erb)

ruby
1<div class="main posts-show">
2  <div class="container">
3    <div class="posts-show-item">
4      <div class="post-user-name">
5        <!-- <img src=" <%= "/user_images/#{@user.image_name}" %> "> -->
6        <!-- <%=link_to(@user.name, "/users/#{@user.id}") %> -->
7      </div>
8      <ul>
9        <li>
10          <label for="user">Organizer:</label>
11          <%=link_to(@user.name, "/users/#{@user.id}", class: "link") %>
12        </li>
13
14        <li>
15          <label for="level">Level:</label>
16          <%= @post.level %>
17        </li>
18
19        <li>
20          <label for="title">Title:</label>
21          <%= @post.title %>
22        </li>
23
24        <li>
25          <label for="maximum">Maximum&nbsp;participants:</label>
26          <%= @post.maximum %>
27        </li>
28
29        <li>
30          <label for="maximum">Schedule:</label>
31          <%= @post.maximum %>
32          Schedule:
33        </li>
34
35        <li>
36          Rules:
37        </li>
38        <li>
39          <label for="message">Message:</label>
40          <%= @post.message %>
41        </li>
42      </ul>
43      <div class="post-time">
44        <%= @post.created_at %>
45      </div>
46      <% if Like.find_by(user_id: @current_user.id, post_id: @post.id) %>
47        <%= link_to("/likes/#{@post.id}/destroy", {method: "post"}) do %>
48          <span class="fa fa-heart like-btn-unlike"></span>
49        <% end %>
50      <% else %>
51        <%= link_to("/likes/#{@post.id}/create", {method: "post"}) do %>
52          <span class="fa fa-heart like-btn"></span>
53        <% end %>
54      <% end %>
55      <%= @likes_count %>
56      <h3>
57        <%= render 'users/likes' %>
58      </h3>
59
60      <% if @post.user_id == @current_user.id %>
61        <div class="post-menus">
62          <ul>
63            <li>
64             <%= link_to("Edit", "/posts/#{@post.id}/edit", class: "link") %>
65            </li>
66
67            <li>
68             <%= link_to("Delete", "/posts/#{@post.id}/destroy", {method: :post, data: {confirm: "Are you sure to delete this event？"}, class: "link"}) %>
69            </li>
70          </ul>
71        </div>
72      <% end %>
73    </div>
74  </div>
75</div>

該当のソースコード(posts#_likes.html.erb)

ruby
1<% @likes.each do |like| %>
2  <% user = User.find_by(id: like.user_id) %>
3  <div class="users-index-item">
4    <div class="user-left">
5      <img src="<%= "/user_images/#{user.image_name}" %>">
6    </div>
7    <div class="user-right">
8      <%= link_to(user.name, "/users/#{user.id}") %>
9    </div>
10  </div>
11<% end %>

試したこと

自分（ログイン中のユーザー）が「いいね」した投稿一覧は表示できたのでその逆の要領でコードを書いてみましたが、どこかがおかしい様です。

補足情報（FW/ツールのバージョンなど）

ruby 2.6.4p104
RubyGems 3.0.3
Rails 5.2.3

行動規範の内容に同意します

回答1件

ベストアンサー

@likes を使っていますが、def show で定義されていないためのエラーです
@likes_count = Like.where(post_id: @post.id).count
を
@likes = Like.where(post_id: @post.id)
に変え、viewのなかの　@likes_count　を　@likes.count　にしてください

投稿2020/02/11 08:39