Database
[{accountName:"pippo",whishList:{element1:[{price:25,time:"2024-02-20T20:00:00.000+00:00"},{price:30,time:"2024-02-21T20:00:00.000+00:00"}]}}]
Query
db.collection.update({accountName:"pippo",$expr:{$ne:[{$last:"$whishList.element1.price"},50]}},{$push:{"whishList.element1":{value:50,time:new Date()}}})