How to show all the Users who have liked my post - html

Question

I apologize for the newbie questions still relatively new to rails. I'm trying to show all the users who have liked my specific posts. I took a look at this similar question How to list the users who LIKE a given Post but it couldn't solve my problem. I listed below all the relevant simple code - thank you so much guys!!
Items Controller
class ItemsController < ApplicationController
before_action :authenticate_user!, only: [:new, :create]
before_action :set_item, only: [:show, :edit, :update, :destroy, :share]
def index
#items = Item.order("created_at DESC")
end
end
Index.html.erb
<% if user_signed_in? %>
<%= image_tag current_user.avatar, width: 70, class: "css-style" %>
<br>
<strong><%= link_to current_user.username, current_user, class: "profile-style" %></strong>
<ul><!--Trying to show all the users who have liked my specific posts here -->
<% item.likes.each do |like| %>
<li> <%= link_to(like.user.username, like.user) %></li>
<% end %>
</ul>
<br>
<br>
<% else %>
<%= link_to 'Login/SignUp', new_user_session_path %>
<% end %>
<% #items.each do |item| %>
<%= image_tag item.avatar.url(:medium), class: "block" %>
<div>
<%= render partial: "likes", locals: {item: item} %></span><%= item.likes_count %>
</div>
<% end %>
Items.rb
class Item < ApplicationRecord
has_many :likes, :counter_cache => true
belongs_to :user
has_attached_file :avatar, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
validates_attachment_content_type :avatar, content_type: /\Aimage\/.*\z/
end
User.rb
class User < ApplicationRecord
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :omniauthable, omniauth_providers: [:facebook]
has_many :likes
has_attached_file :avatar, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
validates_attachment_content_type :avatar, content_type: /\Aimage\/.*\z/
def likes?(post)
post.likes.where(user_id: id).any?
end
end
Users Controller
class UsersController < ApplicationController
before_action :set_user, only: [:show, :edit, :update, :destroy, :share]
def index
#users = User.all
end
def show
#user = User.find(params[:id])
#items = Item.all
end
private
def set_user
#user = User.find(params[:id])
end
def item_params
params.require(:item).permit(:product, :amount, :city_id, :avatar)
end
end
Like.rb
class Like < ApplicationRecord
belongs_to :item, :counter_cache => true
belongs_to :user
end
Likes Controller
class Items::LikesController < ApplicationController
before_action :authenticate_user!
before_action :set_book
def create
#item.likes.where(user_id: current_user.id).first_or_create
respond_to do |format|
format.html {redirect_to #item}
format.js
end
end
def destroy
#item.likes.where(user_id: current_user.id).destroy_all
respond_to do |format|
format.html {redirect_to #item}
format.js
end
end
private
def set_book
#item = Item.find(params[:item_id])
end
end
Logs
Processing by ItemsController#index as HTML
Rendering items/index.html.erb within layouts/application
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ? [["id", 1], ["LIMIT", 1]]
Item Load (0.3ms) SELECT "items".* FROM "items" ORDER BY created_at DESC
Rendered items/index.html.erb within layouts/application (287.6ms)
Completed 500 Internal Server Error in 313ms (ActiveRecord: 0.6ms)
ActionView::Template::Error (undefined local variable or method `item' for #<#:0x007f9afbfd14f0>
Did you mean? item_url
items_url
item_path
#items):
5:
6: <%= link_to current_user.username, current_user, class: "profile-style" %>
7:
8: <% item.likes.each do |like| %>
9: <%= link_to(like.user.username, like.user) %>
10: <% end %>
11:
app/views/items/index.html.erb:8:in `_app_views_items_index_html_erb___2312434021832006771_70151814680620'
Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout
Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (8.3ms)
Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.3ms)
Rendering /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.2ms)
Rendered /usr/local/lib/ruby/gems/2.3.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (94.4ms)

Answer 1

In items/index.html.erb you are referencing #item.likes.each on line 9, but the instance variable #item has not been set in items_controller#index. You have only defined #items, hence the error you are receiving about nil not responding to #likes.
If you want to see the likes for all items, there are a number of ways to achieve this with Arel.

Answer 2

It's a simple mistake. I think the problem is with your partial.. you're calling the partial with locals and inside your template code you are referring to it with #item instead of item, here item is not an instance variable.
<% #items.each do |item| %>
<%= image_tag item.avatar.url(:medium), class: "block" %>
<div>
<%= render partial: "likes", locals: {item: item} %></span><%= item.likes_count %>
</div>
<% end %>
The thing is when you render a partial with locals you need to use the locals as normal variables not as instance variables.
This should work.
<% item.likes.each do |like| %>
<li> <%= link_to(like.user.username, like.user) %></li>
<% end %>

Answer 3

You need one more table(model) "likes" and association has-many-through. Something like this:
class Item
has_many :likes
has_many :users, through: :likes
end
class Like
belongs_to :user
belongs_to :item
end
class User
has_many :likes
has_many :items
has_many :liked_items, through: :likes
end