codeignietor购物车只有一个产品正在添加到购物车

Question

在做购物车页面时，我只能将一个产品添加到购物车类，antor产品没有进入该类。我的控制器，型号     控制器类     公共功能购买（$ id）{

        $product = $this->mproduct->find($id);
        $res['result'] = $product;

        $data = array(
           'id'      => $product->pro_id,
           'qty'     => '1',
           'price'   => $product->pro_price,
           'name'    => $product->pro_title,

        );
    $array =  (array) $data;
    $this->cart->insert($array);
    $this->load->view('cart',$res);



    }

    public function delete($row_id){
        $this->cart->update(array('rowid' => $row_id,'qty' => 0));
        $this->load->view('cart');
    }


    public function update(){

        $i=1;
        foreach ($this->cart->contents() as $items) {

            $this->cart->update(array('rowid' =>$items['rowid'],'qty' => $_POST['qty'.$i]));
            $i++;

        }
        $this->load->view('cart');
    }

模特

public function find($id)
{
    $this->db->where('pro_id',$id);
    return $this->db->get('products')->row();

}