Comment created on articles page not saving to database - ruby-on-rails

Question

Not sure why comments created on _comment_form.html.erb is not being rendered on articles/:id
I'm referencing this youtube tutorial: https://www.youtube.com/watch?v=IUUThhcGtzc
Comments controller:
class CommentsController < ApplicationController
before_action :authenticate_user!
before_action :set_article
def create
#comment = #article.comments.create(params[:comment].permit(:content, :article_id, :user_id))
#comment.user = current_user
#comment.save
if #comment.save
redirect_to #article
else
redirect_to #article
end
end
private
def set_article
#article = Article.find(params[:article_id])
end
end
Articles controller:
class ArticlesController < ApplicationController
before_action :authenticate_user!, except: [:index, :show]
before_action :set_article, only: [:show, :edit, :update, :destroy]
def show
#comments = Comment.where(article_id: #article).order("created_at DESC")
end
private
def set_article
#article = Article.find(params[:id])
end
end
_comment.html.erb (from articles/show.html.erb)
<%= render 'comments/comment_form' %>
<% #comments.each do |comment| %>
<%= comment.content %>
<% end %>
_comment_form.html.erb
<% if user_signed_in? %>
<%= form_for ([#article, #article.comments.build]) do |f| %>
<div class="form-group">
<%= f.label :content %>
<%= f.text_area :content, class: 'form-control' %>
</div>
<%= f.submit 'Post Comment', class: 'btn btn-primary' %>
<% end %>
<% end %>
routes.rb
resources :articles do
resources :comments
end

Answer 1

Some considerations I would like to do:
#comment.save
if #comment.save
When you do that, you're saving twice. Calling #comment.save on if condition already saves the article and return true or false if it was successful. Also, replace .save for .save!, so it will raise an exception in case it doesn't save, so you can check the reason on rails server log.
Also, think it's unnecessary to do this:
#comments = Comment.where(article_id: #article).order("created_at DESC")
Since you already set the #article, you can access #article.comments, once you put has_many :comments on article model.
You can also check on rails console if the Article was created correctly. Create a new one, and get it like article = Article.last, then you can check article.comments.
Hope this helps!