await Cart.update(
{ $elemMatch: { user_id: decoded._id } },
{
$addToSet: {
"cart.&.items": {
product_id: req.query.product_id,
quantity: 1,
},
},
}
);
My goal is to add elements to the array of items in the cart.
There's no syntax with & sign. MongoDB offers $ as a positional operator which allows you to modify existing item but you don't needed since you just want to append a new object to an array, try:
{
$addToSet: {
"cart.items": {
product_id: req.query.product_id,
quantity: 1,
}
}
}
{ user_id: decoded._id }, $elemMatch is for querying the array$addToSet but same value was already there? Cart.updateMany(
{ user_id: decoded._id },
{
$push: {
"cart.items": {
product_id: req.query.product_id,
quantity: 1,
},
},
}
)
I finally found the right method through trial and error.