How to collect all data from a form in Rails?

Question

Ruby on Rails

I write the data from the form to a JSON file, I made the form, in the controller I figured out how to create a file, the file is created where necessary with the right name, but I don’t understand how I can serialize (or something else) to collect all the data from the form and in the right format put them in the created file.
The form itself:

<h1>Тут можно добавить элементы</h1>
<%= form_for :article, url: articles_path do |f| %>
  <p>
    <%= f.label :Категория %><br>
    <%= f.text_field :text %>
  </p>

  <p>
    <%= f.label :Название %><br>
    <%= f.text_field :title %>
  </p>

  <p>
    <%= f.label :Ссылка_на_картинку %><br>
    <%= f.text_field :text %>
  </p>

  <p>
    <%= f.label :id %><br>
    <%= f.text_field :text %>
  </p>

  <p>
    <%= f.label :Цвет %><br>
    <%= f.text_field :text %>
  </p>

  <p>
    <%= f.label :Цена %><br>
    <%= f.text_field :text %>
  </p>

  <p>
    <%= f.submit :Добавить %>
  </p>
<% end %>

Controller:

class ArticlesController < ApplicationController
  def new
  end
  def create
    require 'json'

    data = [{ "foo" => "bar" } , { "foo1" => "bar1" }]

    File.open("output.json", "w+") do |f| f.write(JSON.generate(data)) end
      redirect_to :back
    # File.open("myList.json", "w") { @my_model.my_data = params[:my_fields] }
  end
end

Answer 1

params[:article].to_json