things_controller.rb

# app/controllers/things_controller.rb
class ItemsController < ApplicationController
  def create
    thing = Thing.new(thing_params)
    if thing.create
      render json: thing, status: :created
    else
      render json: thing, status: :unprocessable_entity
    end
      
  end
  
  private

  def thing_params
    params.permit(:name, :the_file)
  end
end