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resources :articles do
  resources :comments
end

<%= form_for([@article, @article.comments.build]) do |f| %>
  <p>
    <%= f.label :commenter %><br>
    <%= f.text_field :commenter %>
  </p>
  <p>
    <%= f.label :body %><br>
    <%= f.text_area :body %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

class CommentsController < ApplicationController
  def create
    @article = Article.find(params[:article_id])
    @comment = @article.comments.create(comment_params)
    redirect_to article_path(@article)
  end
 
  private
    def comment_params
      params.require(:comment).permit(:commenter, :body)
    end
end

class Comment < ApplicationRecord
  belongs_to :article
end

class Article < ApplicationRecord
  has_many :comments
  validates :title, presence: true,
                    length: { minimum: 5 }
end