How do I add a document to existing filled collection? - php

Question

I am building an eShop for educational purposes and I need to handle the orders from a user. A user has a basket which is getting filled with products. If he decides buy another product I have insert a document into the existing collection of the card
Current MongoDB collection:
{
"_id": {
"$oid": "61f3d79c921000006000547d"
},
"username": "mike",
"products": {[
"number": "3",
"name": "Honduras",
"price": 7,
"stock": 10,
]},
"status": "UNPAID"
}
By adding another product, needs to be inserted in the existing collection in the field of products.
Expected to look like:
{
"_id": {
"$oid": "61f3d79c921000006000547d"
},
"username": "mike",
"products": {[
"number": "3",
"name": "Honduras",
"price": 7,
"stock": 10,
], [
"number": "4",
"name": "India",
"price": 10,
"stock": 11,
]},
"status": "UNPAID"
}
I am using PHP for the back end operations. The script that I wrote it is simple. I am searching if orders with user's username exist. If they exist then I lock the current order and make the operations needed.
I think that I am missing something in syntax of the update for the purpose described above:
PHP script:
if (isset($_POST['add'])){
// Ordered by name from URL
$username = $_GET['username'];
// Product info
$name = $_POST['add'];
// Finds the product selected from products
$product = $collection -> findOne(array("name" => "$name"));
// Serialize product to be added.
$json = MongoDB\BSON\toJSON(MongoDB\BSON\fromPHP($product));
// Searching for order from certain user
$collection = $db -> orders;
$exists = $collection -> findOne(array("username" => "$username"));
if (!is_null($exists)){
// The problem is here (maybe?)
$exists->updateOne(
array("products" => {}),array('$set'=>$json);
);
}
Any help and suggestions would be really appreciated!

Answer 1

Well, you need to use something like below
db.collection.update(
{find Condition},
{$push: {products : {key: value, key2: value 2}}
)
Here the catch is push. It adds an element to array. Here the element is an object.