How to copy field data and use it in another field of same document using mongoose?

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 ?

>Solution :

use update $set with $concatArrays

    $set: {
      orders: {
        $concatArrays: [
      carts: []


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