Add products to wishlist

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	public function getWishLists($customer_id) {
		$query = $this->db->query("SELECT pd.name, p.product_id, p.image, p.model, p.price, p.tax_class_id FROM " . DB_PREFIX . "wishlist w LEFT JOIN " . DB_PREFIX . "product p ON (w.product_id = p.product_id) LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) WHERE w.customer_id = '" . (int)$customer_id . "' and pd.name !=''");	
		
		return $query->rows;
	}

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	public function getWishLists($customer_id) {
		$query = $this->db->query("SELECT pd.name, p.product_id, p.image, p.model, p.price, p.tax_class_id FROM " . DB_PREFIX . "wishlist w LEFT JOIN " . DB_PREFIX . "product p ON (w.product_id = p.product_id) LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) WHERE w.customer_id = '" . (int)$customer_id . "' AND pd.language_id = '" . (int)$this->config->get('config_language_id') . "' and pd.name !=''");	
		
		return $query->rows;
	}

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Fatal error: Call to a member function http() on a non-object in C:\xampp\htdocs\opencart\catalog\controller\account\wish_list.php on line 33

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if ($this->customer->isLogged() && @$this->request->get['product_id']) {			
			
			if($this->model_account_wish_list->addProductWishList($this->customer->getId(), $this->request->get['product_id']))
			{
				$this->session->data['success'] = $this->language->get('text_success');
			}
			[b][color=#FF0000]$this->redirect($this->url->http('account/wish_list'));[/color][/b]
		}