discourse/app/assets/javascripts/admin/addon/routes/admin-customize-form-templates-edit.js

import DiscourseRoute from "discourse/routes/discourse";
import FormTemplate from "admin/models/form-template";

export default class AdminCustomizeFormTemplatesEdit extends DiscourseRoute {
  model(params) {
    return FormTemplate.findById(params.id);
  }

  setupController(controller, model) {
    controller.set("model", model);
  }
}