How to allow users delete their own comments and not others - ruby-on-rails

Question

In my Rails App, I have a comment model ,a devise user model and a tales model. For each tales post , I have comments posted by signed-in users.The problem here is every other logged in user is able to delete the comments of other user.I want a functionality such that only the user who created the comments can delete it.
My user.rb is here
class User < ActiveRecord::Base
has_one :profile, dependent: :destroy
has_many :tales, dependent: :destroy
end
My comment.rb is here
class Comment < ActiveRecord::Base
belongs_to :tale
end
My tale.rb is here
class Tale < ActiveRecord::Base
belongs_to :user
has_many :comments, dependent: :destroy
belongs_to :category
end
My routes.rb is as follows
Rails.application.routes.draw do
get 'tales/index'
devise_for :users, controllers: { registrations: "registrations" }
resources :profiles
resources :tales do
resources :comments
end
resources :categories
authenticated :user do
root "tales#index"
end
unauthenticated :user do
get "/" => "tales#index"
end
end
My comment controller is here:
class CommentsController < ApplicationController
before_action :authenticate_user!
def create
#tale = Tale.find(params[:tale_id])
#comment = #tale.comments.create(comment_params)
redirect_to tale_path(#tale)
end
def destroy
#tale = Tale.find(params[:tale_id])
#comment = #tale.comments.find(params[:id])
#comment.destroy
end
private
def comment_params
params.require(:comment).permit(:name, :body, :tale_id)
end
end
The excerpt from my tales/show page to add comments is here:
<div id="comments">
<h2><%= #tale.comments.count %> Comments</h2>
<%= render #tale.comments %>
<h3>Add a comment:</h3>
<%= render "comments/form" %>
</div>
</div>
My _comment.html.erb is here
<div class="comment clearfix">
<div class="comment_content">
<p class="comment_name"><strong><%= comment.name %></strong></p>
<p class="comment_body"><%= comment.body %></p>
<p class="comment_time"><%= time_ago_in_words(comment.created_at) %>
Ago</p>
</div>
<% if user_signed_in? %>
<p><%= link_to 'Delete', [comment.tale, comment], method: :delete, data:
{ confirm: 'Are you sure?' } %></p>
<% end %>
</div>
I see no connection between user and comments and I dont the right way to do it here.Can someone guide me through this such that I can do so without using any gems .

Answer 1

You don't appear to have a relationship between Comment and User. You would need something like this in your Comment class assuming you are storing the user_id for each comment:
belongs_to :user
Then in your CommentsController your destroy method should be something like this:
def destroy
# Only the comments posted by that user will be returned
#comment = #user.comments.find(params[:id])
#comment.destroy
end

Answer 2

Add use_id in comments table if don't have
add_column :comments, :user_id, :integer
in your view file put following condition. Delete link will only visible to user who added comment.
<% if user_signed_in? && current_user.id == comment.user_id %>
<p><%= link_to 'Delete', [comment.tale, comment], method: :delete, data:
{ confirm: 'Are you sure?' } %></p>
<% end %>