Ruby on rails getting article_id inside comments controller - ruby-on-rails

Question

So I am trying to get the article id to pass into the comments.article_id, I have looked all over - and can't find anything(I am fairly new so I doubt I know what I'm looking for) I have been trying for the last couple of hours to pass the articles id to the comments controller then set the comments.article_id to the article id. Here's my code at the moment:
ArticlesController:
class ArticlesController < ApplicationController
require 'comment'
def new
end
def create
#article = Article.new(article_params)
#article.user_id = current_user.id
if #article.save
flash[:success] = "Post created successfully!"
redirect_to article_path(#article)
else
flash[:danger] = "We could not create you're article!"
render 'new'
end
end
def show
#article = Article.find(params[:id])
#comment = Comment.new
end
private
def article_params
params.require(:article).permit(:title, :description)
end
end
My comments controller:
class CommentsController < ApplicationController
def new
end
def create
#comment = Comment.new(comment_params)
#comment.article_id = Article.find(params[:id])
#comment.user_id = current_user.id
if #comment.save
flash[:success] = "Successfully created comment"
redirect_to article_path(#comment.article)
else
debugger
flash[:danger] = "Failed to create comment"
redirect_to article_path(2)
end
end
private
def comment_params
params.require(:comment).permit(:description)
end
end
and my show.html.erb for articles(because I am doing it all in there)
<h1 align="center">Title: <%= #article.title %></h1>
<div class="well col-xs-8 col-xs-offset-2">
<div class="row">
<div class="col-xs-4 col-xs-offset-4">
<div class="well well-sm">
<div class="user-img">
<p class="created">Created By:</p>
<%= gravatar_for #article.user, size: 150 %>
</div>
<div class="user-title">
<%= link_to #article.user.username, user_path(#article.user) %> <br />
</div>
</div>
</div>
</div>
<h4 class="center description"><strong>Description:</strong></h4>
<hr />
<%= simple_format(#article.description) %>
<div class="article-actions">
<% if logged_in? && current_user == #article.user %>
<%= link_to 'Edit', edit_article_path(#article), class: "btn btn-xs btn-primary" %>
<%= link_to 'Delete this article', article_path(#article), method: :delete,
data: { confirm: "Are you sure you want to delete this article?" },
class: "btn btn-xs btn-danger" %>
<%= link_to 'View all articles', articles_path, class: "btn btn-xs btn-success" %>
<% else %>
<%= link_to 'View all articles', articles_path, class: "btn btn-xs btn-success" %>
<% end %>
</div>
<% #article.comment.each do |f| %>
<div id="commentBorder">
<div class="panel panel-default">
<div class="panel-body">
<p><%= f.description %></p>
</div>
<div class="panel-footer">
<div align="center">
<small>Created by <%= f.user.username %>,<br />
<%= time_ago_in_words(f.created_at) %> ago</small></div>
</div>
</div>
</div>
<% end %>
<%= form_for(#comment, :html => {class: "form", role: "forms"}, :url => article_comments_path(#article)) do |comm| %>
<%= comm.label :description %>
<%= comm.text_field :description %>
<%= comm.submit "Post comment" %>
<% end %>

Answer 1

Solution!
So playing around some more literally five minutes after this, inside my Comments controller, I changed #comment.article_id = Article.find(params[:id])
Into
#comment.article_id = params[:article_id]
This fixed it, I have a theory on how so correct me if I am wrong.
From this picture you can see we already have article_id as a parameter(https://i.gyazo.com/fe49dcebbe75c006e95c7f44a9964865.png)
By using params[:article_id] we reached and got the article_id parameter and assigned it to our #comment.article_id value.

Answer 2

Just to be clear about rails associations, you could also have done :
#comment.article = Article.find(params[:article_id])
This has the advantage of ensuring the article exists before setting it's id value to the comment.article_id