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Hi

Sorry to bring up this old post but lack of answer to this case could help some people here.

For anyone looking for more informations about way to un-group or change delimiter of grouped features :

Variable $products.grouped_features is built through ProductLazyArray class, by the function buildGroupedFeatures then called by the function getGroupedFeatures.

Here is the function buildGroupedFeatures (Line 1174 of PrestaShop/src/Adapter/Presenter/Product/ProductLazyArray.php) : 

 protected function buildGroupedFeatures(array $productFeatures)
    {
        $valuesByFeatureName = [];
        $groupedFeatures = [];

        // features can either be "raw" (id_feature, id_product_id_feature_value)
        // or "full" (id_feature, name, value)
        // grouping can only be performed if they are "full"
        if (empty($productFeatures) || !array_key_exists('name', reset($productFeatures))) {
            return [];
        }

        foreach ($productFeatures as $feature) {
            $featureName = $feature['name'];
            // build an array of unique features
            $groupedFeatures[$featureName] = $feature;
            // aggregate feature values separately
            $valuesByFeatureName[$featureName][] = $feature['value'];
        }

        // replace value from features that have multiple values with the ones we aggregated earlier
        foreach ($valuesByFeatureName as $featureName => $values) {
            if (count($values) > 1) {
                sort($values, SORT_NATURAL);
                $groupedFeatures[$featureName]['value'] = implode("\n", $values);
            }
        }

        return $groupedFeatures;
    }

The implode can be replaced with another delimiter (I used a semicolon with spaces in my case) or set in an array with an unique id which will be called into a foreach loop.

Hope this helps

Hi

Sorry to bring up this old post but lack of answer to this case could help some people here.

For anyone looking for more informations about way to un-group or change delimiter of grouped features :

Variable $products.grouped_features is built through ProductLazyArray class, by the function getGroupedFeatures.

Here is the function (Line 1174 of PrestaShop/src/Adapter/Presenter/Product/ProductLazyArray.php) : 

 protected function buildGroupedFeatures(array $productFeatures)
    {
        $valuesByFeatureName = [];
        $groupedFeatures = [];

        // features can either be "raw" (id_feature, id_product_id_feature_value)
        // or "full" (id_feature, name, value)
        // grouping can only be performed if they are "full"
        if (empty($productFeatures) || !array_key_exists('name', reset($productFeatures))) {
            return [];
        }

        foreach ($productFeatures as $feature) {
            $featureName = $feature['name'];
            // build an array of unique features
            $groupedFeatures[$featureName] = $feature;
            // aggregate feature values separately
            $valuesByFeatureName[$featureName][] = $feature['value'];
        }

        // replace value from features that have multiple values with the ones we aggregated earlier
        foreach ($valuesByFeatureName as $featureName => $values) {
            if (count($values) > 1) {
                sort($values, SORT_NATURAL);
                $groupedFeatures[$featureName]['value'] = implode("\n", $values);
            }
        }

        return $groupedFeatures;
    }

The implode can be replaced with another delimiter (I used a semicolon with spaces in my case) or set in an array with an unique id which will be called into a foreach loop.

Hope this helps