Question

When i create a shopping cart with CI Cart Class, it add the product to the cart first 1 and then when i add that product to the cart next time it is also add 1 product not 2.

I want to do it the quantity in the cart is increased when someone adds an item to their cart and that exact same item is already in the cart.

Answer 1

It would be helpful if you could post some code or what data you are sending to the cart class but this should point you in the right direction:

function add_cart_item(){

        $data = $_POST;

        $id = $data['product_id'];    //get new product id
        $qty = $data['quantity'];     //get quantity if that item       
        $cart = $this->cart->contents(); //get all items in the cart
            $exists = false;             //lets say that the new item we're adding is not in the cart
            $rowid = '';

            foreach($cart as $item){
                if($item['id'] == $id)     //if the item we're adding is in cart add up those two quantities
                {
                    $exists = true;
                    $rowid = $item['rowid'];
                    $qty = $item['qty'] + $qty;
                }       
            }

            if($exists)
            {
                $this->cart_model->update_item($rowid, $qty);                   
                echo 'true'; // For ajax calls if javascript is enabled, return true, so the cart gets updated          
            }
            else
            {
                if($this->cart_model->add_cart_item() == TRUE)
                {           
                    echo 'true'; // for ajax calls if javascript is enabled, return true, so the cart gets updated
                }
            }   

}   

and in the cart_model you would have update and add functions that look something like this

function update_item($rowid, $qty){     

        // Create an array with the products rowid's and quantities. 
        $data = array(
             'rowid' => $rowid,
             'qty'   => $qty
          );

    // Update the cart with the new information
        $this->cart->update($data);
    }


    // Add an item to the cart
    function add_cart_item(){

        $id = $this->input->post('product_id'); // Assign posted product_id to $id
        $qty = $this->input->post('quantity'); // Assign posted quantity to $cty
        //$img = $this->input->post('image'); // Assign posted quantity to $img

        $this->db->where('id', $id); // Select where id matches the posted id
        $query = $this->db->get('products', 1); // Select the products where a match is found and limit the query by 1

        // Check if a row has been found
        if($query->num_rows > 0){

            foreach ($query->result() as $row)
            {
                $data = array(
                    'id'      => $id,
                    'qty'     => $qty,
                    'price'   => $row->price,
                    'name'    => $row->name,
                    //'options' => array('image' => $img),
                );

                $this->cart->insert($data); 

                return TRUE;
            }

        // Nothing found! Return FALSE! 
        }else{
            return FALSE;
        }
    }