Push into session issue in Laravel - laravel

Question

Each item contains a list of addons as checkboxes. Every time I check an addon I want to push addon_id into the addons array. It's pushing an addon_id to session but it's not pushing it properly.
This code adds item to cart (Notice: I am creating an empty addons array):
$cart = session()->get('cart', []);
if(isset($cart[$request->item_id])) {
$cart[$request->item_id]['qty']++;
} else {
$cart[$request->item_id] = [
'id' => $request->item_id,
'category_id' => $request->category_id,
'price' => $request->item_price,
'item_name' => $request->item_name,
'qty' => 1,
'addons' => [],
];
}
session()->put('cart', $cart);
And this code pushes addons to items:
if(isset($request->item_id)) {
session()->push('cart.addons', $request->addon_id);
}
$cart = session()->get('cart', []);
return response()->json([
'message' => 'Addon added',
'cart' => $cart,
]);
This is how addons are being pushed now:
Array
(
[59] => Array
(
[id] => 59
[category_id] => 27
[price] => 3.78
[item_name] => Simple Sandwich
[qty] => 1
[addons] => Array
(
)
)
[57] => Array
(
[id] => 57
[category_id] => 27
[price] => 5.99
[item_name] => Cheese Burger
[qty] => 1
[addons] => Array
(
)
)
[addons] => Array
(
[0] => 31
)
[addons] => Array
(
[0] => 61,
[1] => 60,
[2] => 31
)
)
I need them to be pushed like this:
Array
(
[59] => Array
(
[id] => 59
[category_id] => 27
[price] => 3.78
[item_name] => Simple Sandwich
[qty] => 1
[addons] => Array
(
[0] => 31
)
)
[57] => Array
(
[id] => 57
[category_id] => 27
[price] => 5.99
[item_name] => Cheese Burger
[qty] => 1
[addons] => Array
(
[0] => 61,
[1] => 60,
[2] => 31
)
)
)
I tried to find a solution but nothing seems to be working the way I need it.
Help is very much appreciated.

Answer 1

Initially you are making an associative array where item_id is the key, but when you are appending in addons you are not specifying against which item_id the addons array should be updated, so you will have to change
if(isset($request->item_id)) {
session()->push('cart.addons', $request->addon_id);
}
to something like this:
if(isset($request->item_id)) {
$cart = session()->get('cart');
if(isset($cart[$request->item_id]) {
array_push($cart[$request->item_id]['addons'],$request->addon_id);
session()->put('cart',$cart);
}
}