accepts-nested-attributes

class Order < ApplicationRecord
  has_many :line_items, inverse_of: :order, dependent: :destroy

  accepts_nested_attributes_for :line_items,
    allow_destroy: true,
    reject_if: ->(attrs) { attrs["product_id"].blank? && attrs["quantity"].blank? }

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["wrapper", "template", "anchor"]

  add(event) {