node.js - How to use a variable as an Object Key [MongoDB] -


this question has answer here:

i'm trying use variable name given me function, setting object key equal 'name'

    function addlist(name, item, id){ // add user's list var $push = {}; $push[name] = item; console.log(id); db.collection('newcon').update({_id: id}, {"$push": {name: item}}); ret(id); }

other solutions similar don't work, since need have build onto array every time function called, not replace whatever in each time.

javascript has no nice notation creating object keys variables:

var $push_query = {}; $push_query[name] = item;  ... {"$push": $push_query} ...

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