function node_ranking

Implements hook_ranking().

File

core/modules/node/node.module, line 725

Code

function node_ranking() {
    // Create the ranking array and add the basic ranking options.
    $ranking = [
        'relevance' => [
            'title' => t('Keyword relevance'),
            // Average relevance values hover around 0.15
'score' => 'i.relevance',
        ],
        'sticky' => [
            'title' => t('Content is sticky at top of lists'),
            // The sticky flag is either 0 or 1, which is automatically normalized.
'score' => 'n.sticky',
        ],
        'promote' => [
            'title' => t('Content is promoted to the front page'),
            // The promote flag is either 0 or 1, which is automatically normalized.
'score' => 'n.promote',
        ],
    ];
    // Add relevance based on updated date, but only if it the scale values have
    // been calculated in node_cron().
    if ($node_min_max = \Drupal::state()->get('node.min_max_update_time')) {
        $ranking['recent'] = [
            'title' => t('Recently created'),
            // Exponential decay with half life of 14% of the age range of nodes.
'score' => 'EXP(-5 * (1 - (n.created - :node_oldest) / :node_range))',
            'arguments' => [
                ':node_oldest' => $node_min_max['min_created'],
                ':node_range' => max($node_min_max['max_created'] - $node_min_max['min_created'], 1),
            ],
        ];
    }
    return $ranking;
}