Automatically relate products by Manufacturer

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$results = $this->model_catalog_product->getProductRelated($this->request->get['product_id']);

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if(count($results)<1 && (int)$this->data['product_info']['manufacturer_id'] > 0){
$results = $this->model_catalog_product->getProductRelatedByManufacturer($this->data['product_info']['manufacturer_id'],$this->request->get['product_id']);
 }

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public function getProductRelated($product_id) {

 $product_data = array();

 $product_related_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product_related WHERE product_id = '" . (int)$product_id . "'");

 foreach ($product_related_query->rows as $result) {

 $product_query = $this->db->query("SELECT DISTINCT *, pd.name AS name, p.image, m.name AS manufacturer, ss.name AS stock, (SELECT AVG(r.rating) FROM " . DB_PREFIX . "review r WHERE p.product_id = r.product_id GROUP BY r.product_id) AS rating FROM " . DB_PREFIX . "product p LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) LEFT JOIN " . DB_PREFIX . "product_to_store p2s ON (p.product_id = p2s.product_id) LEFT JOIN " . DB_PREFIX . "manufacturer m ON (p.manufacturer_id = m.manufacturer_id) LEFT JOIN " . DB_PREFIX . "stock_status ss ON (p.stock_status_id = ss.stock_status_id) WHERE p.product_id = '" . (int)$result['related_id'] . "' AND pd.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p2s.store_id = '" . (int)$this->config->get('config_store_id') . "' AND ss.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p.date_available <= NOW() AND p.status = '1'");                          if ($product_query->num_rows) {

 $product_data[$result['related_id']] = $product_query->row;

 }

 }

 return $product_data;

 }

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public function getProductRelatedByManufacturer($manufacturer_id,$product_id) {

 $product_data = array();

 $product_related_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product WHERE manufacturer_id = '" . (int)$manufacturer_id . "' LIMIT 0,9");

 foreach ($product_related_query->rows as $result) {

 $product_query = $this->db->query("SELECT DISTINCT *, pd.name AS name, p.image, m.name AS manufacturer, ss.name AS stock, (SELECT AVG(r.rating) FROM " . DB_PREFIX . "review r WHERE p.product_id = r.product_id GROUP BY r.product_id) AS rating FROM " . DB_PREFIX . "product p LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) LEFT JOIN " . DB_PREFIX . "product_to_store p2s ON (p.product_id = p2s.product_id) LEFT JOIN " . DB_PREFIX . "manufacturer m ON (p.manufacturer_id = m.manufacturer_id) LEFT JOIN " . DB_PREFIX . "stock_status ss ON (p.stock_status_id = ss.stock_status_id) WHERE p.product_id = '" . (int)$result['product_id'] . "' AND pd.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p2s.store_id = '" . (int)$this->config->get('config_store_id') . "' AND ss.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p.date_available <= NOW() AND p.status = '1'");                          if ($product_query->num_rows && $result['product_id'] != $product_id) {

 $product_data[$result['product_id']] = $product_query->row;

 }

 }

 return $product_data;

 }