discourse-adplugin/admin/assets/javascripts/discourse/routes/admin-plugins-house-ads-show.js

import { TrackedObject } from "@ember-compat/tracked-built-ins";
import DiscourseRoute from "discourse/routes/discourse";
import I18n from "I18n";

export default DiscourseRoute.extend({
  model(params) {
    if (params.ad_id === "new") {
      return new TrackedObject({
        name: I18n.t("admin.adplugin.house_ads.new_name"),
        html: "",
        visible_to_logged_in_users: true,
        visible_to_anons: true,
      });
    } else {
      return new TrackedObject(
        this.modelFor("adminPlugins.houseAds").findBy(
          "id",
          parseInt(params.ad_id, 10)
        )
      );
    }
  },
});