Search product by manufacturer on Opencart 2.3.0.2 - opencart

Question

I would like to search for products by the manufacturer on Opencart 2.3.0.2.
On catalog/model/catalog/product.php
Before
$sql .= " LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id)
I put this code:
$sql .= " LEFT JOIN " . DB_PREFIX . "manufacturer m ON (m.manufacturer_id = p.manufacturer_id) ";
and Before the line:
$sql .= " OR LCASE(p.model) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";
I put this code
$sql .= " ORDER BY p.quantity<1, LCASE(" . $data['sort'] . ")";
But it shows me:
Unknown: Object of class DB could not be converted to string on
catalog\model\catalog\product.php
How can i search name on table manufacturer and shows to my customers products by manufacturer

Answer 1

Try this code it will help you
your last order by code is wrong - remove this
$sql .= " ORDER BY p.quantity<1, LCASE(" . $data['sort'] . ")";
Do this below
before
$sql .= " GROUP BY p.product_id";
put this code
$sql .= " AND p.quantity > 0";
You have to comment this code for More then Zero quantity
/* comment this code
if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
if ($data['sort'] == 'pd.name' || $data['sort'] == 'p.model') {
$sql .= " ORDER BY LCASE(" . $data['sort'] . ")";
} elseif ($data['sort'] == 'p.price') {
$sql .= " ORDER BY (CASE WHEN special IS NOT NULL THEN special WHEN discount IS NOT NULL THEN discount ELSE p.price END)";
} else {
$sql .= " ORDER BY " . $data['sort'];
}
} else {
$sql .= " ORDER BY p.sort_order";
}
*/
and add this
if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
if ($data['sort'] == 'pd.name' || $data['sort'] == 'p.model') {
$sql .= " ORDER BY p.quantity, LCASE(" . $data['sort'] . ")";
} elseif ($data['sort'] == 'p.price') {
$sql .= " ORDER BY (CASE WHEN special IS NOT NULL THEN special WHEN discount IS NOT NULL THEN discount ELSE p.price END)";
} else {
$sql .= " ORDER BY p.quantity, " . $data['sort'];
}
} else {
$sql .= " ORDER BY p.quantity, p.sort_order";
}