discourse/app/assets/javascripts/admin/routes/admin-customize-themes.js.es6

import showModal from 'discourse/lib/show-modal';
import { popupAjaxError } from 'discourse/lib/ajax-error';

export default Ember.Route.extend({
  model() {
    return this.store.findAll('theme');
  },

  setupController(controller, model) {
    this._super(controller, model);
    controller.set("editingTheme", false);
  },

  actions: {
    importModal() {
      showModal('admin-import-theme', {admin: true});
    },

    addTheme(theme) {
      const all = this.modelFor('adminCustomizeThemes');
      all.pushObject(theme);
      this.transitionTo('adminCustomizeThemes.show', theme.get('id'));
    },


    newTheme(obj) {
      obj = obj || {name: I18n.t("admin.customize.new_style")};
      const item = this.store.createRecord('theme');

      item.save(obj).then(() => {
        this.send('addTheme', item);
      }).catch(popupAjaxError);
    }
  }
});