public function update()
    {
        $post = $this->input->post();
        $this->service_id = $post["id"];
        $this->name = $post["name"];
        $this->price = $post["price"];


        if (!empty($_FILES["image"]["name"])) {
            $this->image = $this->_uploadImage();
        } else {
            $this->image = $post["old_image"];
        }

        $this->description = $post["description"];
        $this->db->update($this->_table, $this, array('service_id' => $post['id']));
    }

    public function delete($id)
    {
        $this->_deleteImage($id);
        return $this->db->delete($this->_table, array("service_id" => $id));
    }