Colors are not displayed on the categories page

Quant · April 26, 2019

There is a bug with displaying colors on the categories page when SmartyCache is enabled.
It is not fixed in TB and PS (1.6.x).
Here is an example of how to fix it.

    public function addColorsToProductList(&$products)
    {
        if (!is_array($products) || !count($products) || !file_exists(_PS_THEME_DIR_.'product-list-colors.tpl')) {
            return;
        }

        $productsNeedCache = [];
        foreach ($products as &$product) {
            if (!$this->isCached(_PS_THEME_DIR_.'product-list-colors.tpl', $this->getColorsListCacheId($product['id_product']))) {
                $productsNeedCache[] = (int) $product['id_product'];
            } else {
                $product['color_list'] = $this->context->smarty->fetch(_PS_THEME_DIR_.'product-list-colors.tpl', $this->getColorsListCacheId($product['id_product']));
            }
        }

        unset($product);

        $colors = false;
        if (count($productsNeedCache)) {
            $colors = Product::getAttributesColorList($productsNeedCache);
        } else {
            return;
        }

        Tools::enableCache();
        foreach ($products as &$product) {
            if (isset($colors[$product['id_product']])) {
                $tpl = $this->context->smarty->createTemplate(_PS_THEME_DIR_.'product-list-colors.tpl', $this->getColorsListCacheId($product['id_product']));
                $tpl->assign(
                    [
                        'id_product'  => $product['id_product'],
                        'colors_list' => $colors[$product['id_product']],
                        'link'        => $this->context->link,
                        'img_col_dir' => _THEME_COL_DIR_,
                        'col_img_dir' => _PS_COL_IMG_DIR_,
                    ]
                );
                $product['color_list'] = $tpl->fetch(_PS_THEME_DIR_.'product-list-colors.tpl', $this->getColorsListCacheId($product['id_product']));
            } 
            if (in_array($product['id_product'], $productsNeedCache) && !isset($colors[$product['id_product']])) {
                $product['color_list'] = '';
            }
        }
        Tools::restoreCacheSettings();
    }