Mongodb Shell Commands.js

//Remove field from document.
db.users.update({},{$unset:{cart:1}},{multi:true})

console.log(count)
console.log(upsert);

                            if(err){throw err;}
                           if(count.nModified === 0)
                           {
                               User.update({
                                   _id:req.user._id,
                                   cart:cart.item
                               },{$inc:{'quantity':1}},function(){
                                   res.send("This item was already in your Cart"+`<br>`+"Quantity has been updated")
                               })
                           }
                           else{
                            res.send(true)
                           }