I have two fields in my User Scehma , cart and orders both are array.
I want to copy all the items in cart array to orders array and then remove/delete all the items in my cart array. How do I that ?
CodePudding user response:
use update $set
with $concatArrays
db.collection.update({},
[
{
$set: {
orders: {
$concatArrays: [
"$orders",
"$carts"
]
},
carts: []
}
}
])