Vous avez des produits en promotions, mais ils sont perdu dans le listing produits de vos catégories…
C’est bien dommage, car les mettre en avant lorsqu’un client potentiel cherche dans la catégorie, cela peut fortement le décider à l’acheter plutôt qu’un produit au même prix que chez vos concurrents (ou pratiquement).

Du coup pourquoi pas mettre les produits en promotion en début de liste ?

Pour cela, ajouter le fichier override\classes\Category.php

et ajouter cette fonction modifiée :

public function getProducts(
        $idLang,
        $p,
        $n,
        $orderyBy = null,
        $orderWay = null,
        $getTotal = false,
        $active = true,
        $random = false,
        $randomNumberProducts = 1,
        $checkAccess = true,
        Context $context = null
    ) {
        if (!$context) {
            $context = Context::getContext();
        }

        if ($checkAccess && !$this->checkAccess($context->customer->id)) {
            return false;
        }

        $front = in_array($context->controller->controller_type, array('front', 'modulefront'));
        $idSupplier = (int) Tools::getValue('id_supplier');

        /* Return only the number of products */
        if ($getTotal) {
            $sql = 'SELECT COUNT(cp.`id_product`) AS total
                    FROM `' . _DB_PREFIX_ . 'product` p
                    ' . Shop::addSqlAssociation('product', 'p') . '
                    LEFT JOIN `' . _DB_PREFIX_ . 'category_product` cp ON p.`id_product` = cp.`id_product`
                    WHERE cp.`id_category` = ' . (int) $this->id .
                ($front ? ' AND product_shop.`visibility` IN ("both", "catalog")' : '') .
                ($active ? ' AND product_shop.`active` = 1' : '') .
                ($idSupplier ? 'AND p.id_supplier = ' . (int) $idSupplier : '');

            return (int) Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue($sql);
        }

        if ($p < 1) {
            $p = 1;
        }

        /** Tools::strtolower is a fix for all modules which are now using lowercase values for 'orderBy' parameter */
        $orderyBy = Validate::isOrderBy($orderyBy) ? Tools::strtolower($orderyBy) : 'position';
        $orderWay = Validate::isOrderWay($orderWay) ? Tools::strtoupper($orderWay) : 'ASC';

        $orderByPrefix = false;
        if ($orderyBy == 'id_product' || $orderyBy == 'date_add' || $orderyBy == 'date_upd') {
            $orderByPrefix = 'p';
        } elseif ($orderyBy == 'name') {
            $orderByPrefix = 'pl';
        } elseif ($orderyBy == 'manufacturer' || $orderyBy == 'manufacturer_name') {
            $orderByPrefix = 'm';
            $orderyBy = 'name';
        } elseif ($orderyBy == 'position') {
            $orderByPrefix = 'cp';
        }

        if ($orderyBy == 'price') {
            $orderyBy = 'orderprice';
        }

        $nbDaysNewProduct = Configuration::get('PS_NB_DAYS_NEW_PRODUCT');
        if (!Validate::isUnsignedInt($nbDaysNewProduct)) {
            $nbDaysNewProduct = 20;
        }

        // promo filter
        $extra_order_by = '`reduction` DESC, ';
        $extra_select = ', EXISTS(SELECT * from `' . _DB_PREFIX_ . 'specific_price` sp WHERE p.`id_product` = sp.`id_product` AND sp.reduction > 0 AND (("' . date('Y-m-d') . ' 00:00:00" between sp.from and sp.to) OR (sp.from = "0000-00-00 00:00:00" AND sp.to = "0000-00-00 00:00:00"))) as reduction';
        

        $sql = 'SELECT p.*, product_shop.*, stock.out_of_stock, IFNULL(stock.quantity, 0) AS quantity' . (Combination::isFeatureActive() ? ', IFNULL(product_attribute_shop.id_product_attribute, 0) AS id_product_attribute,
                    product_attribute_shop.minimal_quantity AS product_attribute_minimal_quantity' : '') . ', pl.`description`, pl.`description_short`, pl.`available_now`,
                    pl.`available_later`, pl.`link_rewrite`, pl.`meta_description`, pl.`meta_keywords`, pl.`meta_title`, pl.`name`, image_shop.`id_image` id_image,
                    il.`legend` as legend, m.`name` AS manufacturer_name, cl.`name` AS category_default,
                    DATEDIFF(product_shop.`date_add`, DATE_SUB("' . date('Y-m-d') . ' 00:00:00",
                    INTERVAL ' . (int) $nbDaysNewProduct . ' DAY)) > 0 AS new, product_shop.price AS orderprice' . $extra_select . '
                FROM `' . _DB_PREFIX_ . 'category_product` cp
                LEFT JOIN `' . _DB_PREFIX_ . 'product` p
                    ON p.`id_product` = cp.`id_product`
                ' . Shop::addSqlAssociation('product', 'p') .
        (Combination::isFeatureActive() ? ' LEFT JOIN `' . _DB_PREFIX_ . 'product_attribute_shop` product_attribute_shop
                ON (p.`id_product` = product_attribute_shop.`id_product` AND product_attribute_shop.`default_on` = 1 AND product_attribute_shop.id_shop=' . (int) $context->shop->id . ')' : '') . '
                ' . Product::sqlStock('p', 0) . '
                LEFT JOIN `' . _DB_PREFIX_ . 'category_lang` cl
                    ON (product_shop.`id_category_default` = cl.`id_category`
                    AND cl.`id_lang` = ' . (int) $idLang . Shop::addSqlRestrictionOnLang('cl') . ')
                LEFT JOIN `' . _DB_PREFIX_ . 'product_lang` pl
                    ON (p.`id_product` = pl.`id_product`
                    AND pl.`id_lang` = ' . (int) $idLang . Shop::addSqlRestrictionOnLang('pl') . ')
                LEFT JOIN `' . _DB_PREFIX_ . 'image_shop` image_shop
                    ON (image_shop.`id_product` = p.`id_product` AND image_shop.cover=1 AND image_shop.id_shop=' . (int) $context->shop->id . ')
                LEFT JOIN `' . _DB_PREFIX_ . 'image_lang` il
                    ON (image_shop.`id_image` = il.`id_image`
                    AND il.`id_lang` = ' . (int) $idLang . ')
                LEFT JOIN `' . _DB_PREFIX_ . 'manufacturer` m
                    ON m.`id_manufacturer` = p.`id_manufacturer`
                   
                WHERE product_shop.`id_shop` = ' . (int) $context->shop->id . '
                    AND cp.`id_category` = ' . (int) $this->id
            . ($active ? ' AND product_shop.`active` = 1' : '')
            . ($front ? ' AND product_shop.`visibility` IN ("both", "catalog")' : '')
            . ($idSupplier ? ' AND p.id_supplier = ' . (int) $idSupplier : '');

        if ($random === true) {
            $sql .= ' ORDER BY RAND() LIMIT ' . (int) $randomNumberProducts;
        } else {
            $sql .= ' ORDER BY ' . $extra_order_by  . (!empty($orderByPrefix) ? $orderByPrefix . '.' : '') . '`' . bqSQL($orderyBy) . '` ' . pSQL($orderWay) . '
            LIMIT ' . (((int) $p - 1) * (int) $n) . ',' . (int) $n;
        }

        
        $result = Db::getInstance(_PS_USE_SQL_SLAVE_)->executeS($sql, true, false);

        if (!$result) {
            return array();
        }

        if ($orderyBy == 'orderprice' && empty($extra_order_by)) {
            Tools::orderbyPrice($result, $orderWay);
        }

        // Modify SQL result
        return Product::getProductsProperties($idLang, $result);
    }

Concretement on va ajouter une colonne dans le select qui vérifie s’il existe une promo ou non et on ajoute un tri sur cette colonne.

Voilà !