Make Gift Vouchers searchable

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$sql .= " LEFT JOIN " . DB_PREFIX . "product_description pd

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$sql .= " LEFT JOIN `" . DB_PREFIX . "order_product` `op` ON (`op`.`product_id` = `p`.`product_id`) LEFT JOIN `" . DB_PREFIX . "order_voucher` `ov` ON (`ov`.`order_id` = `op`.`order_id`)";

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$sql .= " LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) LEFT JOIN " . DB_PREFIX . "product_to_store p2s ON (p.product_id = p2s.product_id) WHERE pd.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p.status = '1' AND p.date_available <= NOW() AND p2s.store_id = '" . (int)$this->config->get('config_store_id') . "'";				

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$sql .= " LEFT JOIN " . DB_PREFIX . "product_description pd ON (p.product_id = pd.product_id) LEFT JOIN " . DB_PREFIX . "product_to_store p2s ON (p.product_id = p2s.product_id) WHERE pd.language_id = '" . (int)$this->config->get('config_language_id') . "' AND p.status = '1' AND p.date_available <= NOW() AND p2s.store_id = '" . (int)$this->config->get('config_store_id') . "' AND `pd`.`product_id` = `op`.`product_id`";				

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<?php
class ModelCatalogVoucher extends Model {
	public function getVouchers() {
		$sql = $this->db->query("SELECT * FROM `" . DB_PREFIX . "order_product` `op` INNER JOIN `" . DB_PREFIX . "voucher` `v` ON (`v`.`order_id` = `op`.`order_id`)");
		
		$product_data = array();

		$query = $this->db->query($sql);
		
		$this->load->model('catalog/product');

		foreach ($query->rows as $result) {
			$product_data[$result['product_id']] = $this->model_catalog_product->getProduct($result['product_id']);
		}

		return $product_data;
	}
}

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$data['search'] = $this->load->controller('common/search');

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$data['voucher'] = $this->url->link('common/voucher');

$data['text_voucher'] = $this->language->get('text_voucher');

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$_['text_voucher'] = 'Vouchers';