如何计算用户对我的特定物品的喜欢程度（工资）

Question

My apologies for the newbie question, I'm relatively new to Rails and SQL. I'm trying to count all the likes a User has done on my specific items. With the help of the SO community and from Treehouse Coding I am able to show which Users have liked my specific items. In addition, I was able to research how to show all the likes that I have received (from Lisa, James, Harry, etc.) using .join in my controller. Now I would like to show the count for each specific User. So for instance if James like 4 of my items I would like to show 4 next to James. I have listed all my relevant code below, thank you guys so much!!

Index.html.erb

My Fans - <%= @likersnumero%>
<%- @likers.each do |liker| %>
<%= image_tag liker.avatar, width: 25, class: "css-style"  %>
<%= liker.username %>
<% end %>

Items_controller

def index
@items = Item.order("created_at DESC")
if current_user.present? 
@likers = current_user.items.map(&:likes).flatten.map(&:user).flatten
@likersnumero = current_user.items.joins(:likes).map(&:user).count
end
end

Item.rb

class Item < ApplicationRecord
has_many :likes, :counter_cache => true
end

Users.rb

class User < ApplicationRecord
has_many :likes
def likes?(post)
    post.likes.where(user_id: id).any?
end

#Tried using def total_likes in my index.html.erb using <%= liker.total_likes%>
but got the following
 error SQLite3::SQLException: no such column: likes:
 SELECT SUM(likes) FROM "likes" WHERE "likes"."user_id" = ?"
def total_likes
    likes.sum(:likes)   
end
end

Routes.rb

Rails.application.routes.draw do
resources :items do
resource :like, module: :items
end
root to: "items#index"
end

Schema.rb

create_table "items", force: :cascade do |t|
t.string   "product"
t.integer  "user_id"
t.integer  "item_id"
t.datetime "created_at",                      null: false
t.datetime "updated_at",                      null: false
t.string   "avatar_file_name"
t.string   "avatar_content_type"
t.integer  "avatar_file_size"
t.datetime "avatar_updated_at"
t.integer  "likes_count",         default: 0, null: false
end

create_table "likes", force: :cascade do |t|
t.integer  "user_id"
t.integer  "item_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end

Answer 1

Given liker is the user who liked post and poster_id is the id of the person who create the post.

liker.likes.joins(:items).where('items.user_id = ?', poster_id).count

Or somethings similar. If you post your annotated model or table schema I can probably come up with a better answer.

Answer 2

After countless reading and experiementing I figured out the answer that worked for me. In case anyone might encounter a similar issue - I have provided the answer that worked for me.

To get total likes by a specific user on all users items - In my controller I put the following @likersuno = @likers.map(&:likes).flatten.map(&:user).flatten.uniq

And in my index.html.erb

I simply put this and it worked from there

<%= @likersuno.count %> 

To get total likes by a specific user on my specific items - In my index.html.erb I put the following and it worked beautifully

<%= liker.likes.select { |like| like.item.user == current_user }.count %>