Create a new Prestashop cart in custom php - php

Question

In Prestashop, I've created a custom form where I show a list with all products and the user can fill the corresponding quantities. By submitting the form, I clear the cart and fill it with the new values and finally redirect to the checkout page.
Everything's working fine, but only when the cart already exists. In a case of an empty cart (cart_id==null), I cannot add the products. I tried with several ways to create a $cart but I didn't manage to do so.
I don't get any exceptions, the code is executed without errors, it's just that at the end, in the checkout page, the cart remains empty; I repeat, only when the cart was already empty. In the case of a cart with products in it, then the process is just perfect!
I would appreciate some help on this.
Here is my small controller that gets the products and quantities from the form and adds them in the cart:
include('../../config/config.inc.php');
include('../../header.php');
// Filling the array of products
$products = array();
foreach ($_POST as $key => $value)
if (substr($key, 0, 9) === 'quantity_')
$products[substr($key, 9)] = $value;
// First of all, we remove all products
$prods = $cart->getProducts();
foreach ($prods as $prod)
$cart->deleteProduct($prod['id_product']);
// Adding the new products
foreach ($products as $product_id => $quantity)
if ($quantity > 0)
$cart->updateQty($quantity, $product_id);
// Redirecting to the checkout page.
header("Location: " . $_POST['redirect']);
exit();`
Thank you in advance!

Answer 1

I had the same problem with Prestashop not correctly creating a new cart upon calling the CartCore in many different ways - neither context or direct calls did work out.
Found this gem from someone else over here:
// get cart id if exists
if ($this->context->cookie->id_cart)
{
$cart = new Cart($this->context->cookie->id_cart);
}
// create new cart if needed
if (!isset($cart) OR !$cart->id)
{
$cart = new Cart();
$cart->id_customer = (int)($this->context->cookie->id_customer);
$cart->id_address_delivery = (int) (Address::getFirstCustomerAddressId($cart->id_customer));
$cart->id_address_invoice = $cart->id_address_delivery;
$cart->id_lang = (int)($this->context->cookie->id_lang);
$cart->id_currency = (int)($this->context->cookie->id_currency);
$cart->id_carrier = 1;
$cart->recyclable = 0;
$cart->gift = 0;
$cart->add();
$this->context->cookie->id_cart = (int)($cart->id);
$cart->update();
}
This is working for me now. As you see it goes a little more in depth than just asking the context to retrieve or create a new cart. hth.

Answer 2

You probably need to include this line when you are outside of a class
$context = Context::getContext();
And then add a cart variable that defines cart attributes ( in ur case assigns a id )
$cart = $context->cart; // gets the cart id or creates a new one
Should work fine now
BR's ( dont forget to accept the answer if it helps you :) )

Answer 3

As a complement to previous posts.
If you set that configuration : Configuration::updateValue('PS_CART_FOLLOWING', 1) (display the last cart of the customer instead of creating a new one each time).
You will always get the cart id $this->context->cart->id at NULL when trying to create a new cart at the customer's first log in (after creating a new account) using the following code:
if (is_null($this->context->cart)) {
$this->context->cart =
new Cart($this->context->cookie->id_cart);
}
I manage to solve the problem by adding some code to after the invalid cart creation.
/**
* Manage the possible errors when trying to create
* a new cart for a customer.
*
* The new cart is saved in the current context ($this->context->cart).
*/
private function createCart()
{
if (is_null($this->context->cart)) {
$this->context->cart =
new Cart($this->context->cookie->id_cart);
}
if (is_null($this->context->cart->id_lang)) {
$this->context->cart->id_lang = $this->context->cookie->id_lang;
}
if (is_null($this->context->cart->id_currency)) {
$this->context->cart->id_currency = $this->context->cookie->id_currency;
}
if (is_null($this->context->cart->id_customer)) {
$this->context->cart->id_customer = $this->context->cookie->id_customer;
}
if (is_null($this->context->cart->id_guest)) {
if (empty($this->context->cookie->id_guest)){
$this->context->cookie->__set(
'id_guest',
Guest::getFromCustomer($this->context->cookie->id_customer)
);
}
$this->context->cart->id_guest = $this->context->cookie->id_guest;
}
if (is_null($this->context->cart->id)) {
$this->context->cart->add();
$this->context->cookie->__set('id_cart', $this->context->cart->id);
}
}
After initializing the cart that way, I'm now able to add products to the cart with no problem.
Good success everyone