Pony.fm/app/Contracts/GeneratesNotifications.php

<?php

/**
 * Pony.fm - A community for pony fan music.
 * Copyright (C) 2016 Peter Deltchev
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Poniverse\Ponyfm\Contracts;

use Illuminate\Database\Eloquent\Relations\MorphMany;
use Poniverse\Ponyfm\Models\User;

/**
 * This interface is used for type safety when referring to entities that can be
 * the "target resource" of a notification (ie. what the notification is about).
 *
 * @package Poniverse\Ponyfm\Contracts
 */
interface GeneratesNotifications
{
    /**
     * Returns a human-friendly string (lowercase & singular) representing this
     * type of resource.
     *
     * @return string
     */
    public function getResourceType():string;

    public function activities():MorphMany;
}