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<?php |
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namespace Maslosoft\Manganel\Decorators\QueryBuilder\QueryString; |
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use Maslosoft\Manganel\Interfaces\QueryBuilder\QueryStringDecoratorInterface; |
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use Maslosoft\Manganel\Meta\DocumentPropertyMeta; |
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use Maslosoft\Manganel\Meta\ManganelMeta; |
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use Maslosoft\Manganel\SearchCriteria; |
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/** |
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* BoostDecorator |
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* |
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* @author Piotr Maselkowski <pmaselkowski at gmail.com> |
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*/ |
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class BoostDecorator implements QueryStringDecoratorInterface |
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{ |
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public function decorate(&$queryStringParams, SearchCriteria $criteria) |
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{ |
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$fields = []; |
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$models = $criteria->getModels(); |
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15 |
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foreach ($models as $model) |
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{ |
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$meta = ManganelMeta::create($model); |
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$boosted = $meta->properties('searchBoost'); |
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/* @var $boosted float[] */ |
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foreach ($boosted as $name => $boost) |
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{ |
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if ($boost !== 1.0) |
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{ |
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$fields[$name] = $this->unify($name, $boost, $fields); |
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} |
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} |
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} |
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// No custom boost, ignore |
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if (empty($fields)) |
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{ |
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return; |
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} |
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$boosts = []; |
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foreach ($fields as $name => $boost) |
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{ |
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$boosts[] = sprintf('%s^%f', $name, $boost); |
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} |
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// Add also _all or it would search only boosted fields |
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$boosts[] = '_all'; |
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$queryStringParams['fields'] = $boosts; |
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} |
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/** |
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* Unify boost value if using multi model search with different boost |
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* values for field with same name. |
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* @param string $field |
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* @param float $boost |
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* @param float[] $fields |
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* @return float |
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*/ |
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private function unify($field, $boost, $fields) |
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{ |
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if (!array_key_exists($field, $fields)) |
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{ |
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// No boost set yet, simply set value |
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return $boost; |
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} |
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// There are already some boost set, decide whether to use maximum |
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// or minimum value |
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$current = $fields[$field]; |
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switch (true) |
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{ |
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// Choose minimal boost out of all |
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case $current < 1 && $boost < 1: |
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$boost = min($current, $boost); |
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break; |
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// Choose maximum boost out of all |
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case $current > 1 && $boost > 1: |
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$boost = max($current, $boost); |
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break; |
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// Choose average, as there is no way to decide whether boost should |
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// be above one or below |
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default: |
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$boost = ($current + $boost) / 2; |
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} |
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return $boost; |
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} |
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} |
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Maslosoft /
Manganel
