post-redirect-get

class SubscriptionsController < ApplicationController
  before_action :set_subscription, only: %i[show destroy]

  def new
    @subscription = Subscription.new
  end

<h1>New Article</h1>

<form action="/articles" method="post">
  <div>
    <label for="title">Title</label>
    <input id="title" type="text" name="article[title]"