node.js - Push new items into JSON array -


let's table inside collection:

{     "_id" : objectid("557cf6bbd8efe38c627bffdf"),     "name" : "john doe",     "rating" : 9,     "newf" : [         "milk",         "eggs",         "beans",         "cream"     ] }

once user types in input, sent node server, , node server adds item list "newf", sent mongodb , saved. i'm trying use update, can change values inside of table, i'm not sure how add new items onto list. did $push inside mongodb shell, not sure how on node.

here's snippet of code:

db.collection('connlist').update({ _id: new objectid("e57cf6bb28efe38c6a7bf6df")}, { name: "johndoe", rating: 9, newf: ["milk, eggs", "beans"] }, function(err,doc){       console.log(doc);     });

well syntax adding new items same in shell:

// make sure imported "objectid" var objectid = require('mongodb').objectid;  db.collection('conlist').update(     { "_id": new objectid("e57cf6bb28efe38c6a7bf6df") },     { "$push": { "newf": { "$each": [ "cream", "butter" ] } } },     function(err,numaffected) {         // in callback     } )

or perhaps use .findoneandupdate() if want return modified document instead of making alteration.

of course use $push , possibly $each allows multiple array elements added when adding array. if want "unique" items use $addtoset operation allows.

and speaking other items should use $set or other operators in update portion of document. without these operators "replacing" document content whatever structure place in "update" portion of statement.


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