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<?php |
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/** |
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* Donut Social Network - Yet another experimental social network. |
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* Copyright (C) 2016-2017, Dejan Angelov <[email protected]> |
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* |
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* This file is part of Donut Social Network. |
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* |
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* Donut Social Network is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* Donut Social Network is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with Donut Social Network. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* @package Donut Social Network |
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* @copyright Copyright (C) 2016-2017, Dejan Angelov <[email protected]> |
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* @license https://github.com/angelov/donut/blob/master/LICENSE |
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* @author Dejan Angelov <[email protected]> |
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*/ |
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namespace AppBundle\FriendsSuggestions; |
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use GraphAware\Common\Cypher\Statement; |
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use GraphAware\Common\Cypher\StatementInterface; |
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use GraphAware\Common\Result\Record; |
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use GraphAware\Common\Type\Node; |
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use GraphAware\Reco4PHP\Context\Context; |
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use GraphAware\Reco4PHP\Engine\SingleDiscoveryEngine; |
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use GraphAware\Reco4PHP\Result\SingleScore; |
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use Angelov\Donut\Users\User; |
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class FriendsOfFriends extends SingleDiscoveryEngine |
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{ |
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/** |
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* The statement to be executed for finding items to be recommended. |
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* |
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* @param Node $input |
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* @param Context $context |
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* |
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* @return Statement |
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*/ |
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public function discoveryQuery(Node $input, Context $context): StatementInterface |
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{ |
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$query = ' |
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MATCH (input:User) WHERE id(input) = {id} |
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MATCH (input)-[:FRIEND]->(friend:User)-[:FRIEND]->(friendOfFriend:User) |
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RETURN friendOfFriend as reco, count(*) as score |
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'; |
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return Statement::create($query, ['id' => $input->identity()]); |
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} |
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/** |
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* @return string The name of the discovery engine |
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*/ |
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public function name(): string |
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{ |
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return 'friends_of_friends'; |
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} |
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public function buildScore(Node $input, Node $item, Record $record, Context $context): SingleScore |
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{ |
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return new SingleScore($record->get('score')); |
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} |
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} |
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angelov /
donut
