Context

On PrestaShop 1.7.8.8, Lengow order import fails when the shop is in maintenance mode (PS_CATALOG_MODE enabled). The error in logs is:

import order failed - product 2018 could not be added to cart. Make sure it is available to order or that there is enough in stock

The forceProduct option is enabled in Lengow configuration and should bypass all stock/availability checks, but it does not work.

Root cause analysis

The file classes/models/LengowCart.php on branch 3.x has the following issues:

Bug 1: Attribute::getAttributeMinimalQty() does not exist on PS 1.7.8.8

Lines 139-146 have a version check:

if (!empty($idProductAttribute)) {
    $version = defined('_PS_VERSION_') ? _PS_VERSION_ : '';
    if (version_compare($version, '8.0.0.0', '>=') && !isset($skipAvailabilityCheckOutOfStock)) {
        $minimalQuantity = (int) ProductAttribute::getAttributeMinimalQty($idProductAttribute);
    } else {
        $minimalQuantity = (int) Attribute::getAttributeMinimalQty($idProductAttribute);
    }
}

On PS 1.7.8.8, version_compare('1.7.8.8', '8.0.0.0', '>=') is false, so it calls Attribute::getAttributeMinimalQty(). But this method does not exist on the Attribute class in PS 1.7.8. The Attribute class in PS 1.7 represents product attributes (color, size), NOT combinations. This causes a fatal error or returns an unexpected value.

Fix: Replace with new Combination((int) $idProductAttribute)->minimal_quantity which works on ALL PrestaShop versions (1.6, 1.7, 8, 9). The Combination class has always had the minimal_quantity property mapped to the product_attribute table.

Bug 2: Context::getContext() instead of LengowContext::getContext()

Line 121: $shop = Context::getContext()->shop;
Line 244: $context = Context::getContext()->cloneContext();

The LengowImport::changeContext() method configures the correct shop on the context accessible via LengowContext::getContext(), but the global Context::getContext() may not have the correct shop during cron import. This causes Product::sqlStock() to query stock for the wrong shop and the INSERT INTO cart_product to use a wrong id_shop.

Fix: Replace Context::getContext() with LengowContext::getContext() in both places. Note: LengowContext class exists on the 3.x branch — check it first to confirm. If LengowContext does NOT exist on the 3.x branch, keep Context::getContext() as-is.

Bug 3: Missing containsProduct() and _updateCustomizationQuantity() methods

The updateQty() method calls $this->containsProduct() and $this->_updateCustomizationQuantity(). On PS 1.7.8.8, the parent Cart class provides containsProduct() natively, so this is fine. However _updateCustomizationQuantity() is a protected method on Cart that may have a different signature. Since LengowCart extends Cart, the parent methods are inherited and should work.

However, to be safe and ensure correct behavior, add both methods explicitly to LengowCart:

Add containsProduct() method:

public function containsProduct($idProduct, $idProductAttribute = 0, $idCustomization = 0, $idAddressDelivery = 0)
{
    $sql = 'SELECT *
        FROM `' . _DB_PREFIX_ . 'cart_product`
        WHERE `id_product` = ' . (int) $idProduct . '
        AND `id_product_attribute` = ' . (int) $idProductAttribute . '
        AND `id_cart` = ' . (int) $this->id;

    if (Configuration::get('PS_ALLOW_MULTISHIPPING') && $this->isMultiAddressDelivery()) {
        $sql .= ' AND `id_address_delivery` = ' . (int) $idAddressDelivery;
    }

    return Db::getInstance()->getRow($sql);
}

Add _updateCustomizationQuantity() method:

protected function _updateCustomizationQuantity($quantity, $idCustomization, $idProduct, $idProductAttribute, $idAddressDelivery, $operator = 'up')
{
    $sql = 'SELECT `quantity`
        FROM `' . _DB_PREFIX_ . 'customization`
        WHERE `id_customization` = ' . (int) $idCustomization . '
        AND `id_cart` = ' . (int) $this->id . '
        AND `id_product` = ' . (int) $idProduct . '
        AND `id_product_attribute` = ' . (int) $idProductAttribute;

    if ($result = Db::getInstance()->getRow($sql)) {
        if ($operator == 'down') {
            $newQuantity = (int) $result['quantity'] - (int) $quantity;
            if ($newQuantity < 0) {
                return false;
            }
        } else {
            $newQuantity = (int) $result['quantity'] + (int) $quantity;
        }

        if ($newQuantity == 0) {
            return Db::getInstance()->execute(
                'DELETE FROM `' . _DB_PREFIX_ . 'customization`
                WHERE `id_customization` = ' . (int) $idCustomization
            );
        }

        return Db::getInstance()->execute(
            'UPDATE `' . _DB_PREFIX_ . 'customization`
                SET `quantity` = ' . (int) $newQuantity . '
                WHERE `id_customization` = ' . (int) $idCustomization
        ...

</details>



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