No Method Error in Japas#index - ruby-on-rails

Question

I generated a scaffold called rounds. Here is what my JapasController looks like:
class JapasController < ApplicationController
before_action :set_japa, only: [:show, :edit, :update, :destroy]
before_action :correct_user, only: [:edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
def index
#japas = Japa.all
#users = User.all
end
def show
end
def new
#japa = current_user.japas.build
end
def edit
end
def create
#japa = current_user.japas.build(japa_params)
respond_to do |format|
if #japa.save
format.html { redirect_to #japa, notice: 'Japa was successfully created.' }
format.json { render :show, status: :created, location: #japa }
else
format.html { render :new }
format.json { render json: #japa.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if #japa.update(japa_params)
format.html { redirect_to #japa, notice: 'Japa was successfully updated.' }
format.json { render :show, status: :ok, location: #japa }
else
format.html { render :edit }
format.json { render json: #japa.errors, status: :unprocessable_entity }
end
end
end
def destroy
#japa.destroy
respond_to do |format|
format.html { redirect_to japas_url, notice: 'Japa was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_japa
#japa = Japa.find(params[:id])
end
def correct_user
#japa = current_user.japas.find_by(id: params[:id])
redirect_to japas_path, notice: "Not authorized to edit this japacount" if #japa.nil?
end
# Never trust parameters from the scary internet, only allow the white list through.
def japa_params
params.require(:japa).permit(:rounds, :comment, :user_id)
end
end
Japa Model:
class Japa < ActiveRecord::Base
belongs_to :user
end
User Model:
class User < ActiveRecord::Base
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :japas
end
Here is my index template for Japas:
<p id="notice"><%= notice %></p>
<center>
<h1>Listing Japa</h1>
<table class = 'table table-hover' style = 'width:700px;'>
<thead>
<tr>
<th>Time</th>
<th>Rounds</th>
<th>Goal</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% #users.each do |user| %>
<tr>
<td><%= user.japas.created_at %></td>
<td><%= user.japas.rounds %></td>
<td> / 16 </td>
<td><%= link_to 'Show', japa %></td>
<% if japa.user == current_user %>
<td><%= link_to 'Edit', edit_japa_path(japa) %></td>
<td><%= link_to 'Destroy', japa, method: :delete, data: { confirm: 'Are you sure?' } %></td>
<%end%>
</tr>
<tr>
<td>Total Sum</td>
</tr>
<% end %>
</tbody>
</table>
</center>
<br>
<% if user_signed_in? %>
<%= link_to 'New Japa', new_japa_path %>
<%end%>
Here is my error message when I load: http://localhost:3000/japas.
NoMethodError in Japas#index
Showing /Users/vvd/Desktop/japacounter/app/views/japas/index.html.erb where line #20 raised:
undefined method `created_at' for #<User:0x007f981a4536e8>
Extracted source (around line #20):
<% #users.each do |user| %>
<tr>
<td><%= user.japas.created_at %></td>
<td><%= user.japas.rounds %></td>
<td> / 16 </td>
This is a picture of the error page I am receiving:

Answer 1

Based on your requirements on comments you can try this on.
You have to change your controller action as following for getting japas for the current_user
def index
#japas = Japa.where(user_id: current_user.id)
end
And in view iterate with #japas, as following
<% #japas.each do |japa| %>
<tr>
<td><%= japa.created_at %></td>
<td><%= japa.rounds %></td>
</tr>
<% end %>

Answer 2

You can not call an attribute/method like created_at with an active record associations collection. User has many Japa, so you can re-write you view as following in error area with rest of your code. Just iterate within user.japas.
<% #users.each do |user| %>
<% user.japas.each do |japa| %>
<tr>
<td><%= japa.created_at %></td>
<td><%= japa.rounds %></td>
</tr>
<% end %>
<% end %>