node.js - MongoDB: Update user data based on varying JSON POST data -

using mean environment (including mongoose database access) send varying json data web form (user profile input form) server. there, want update user's document based on data sent server. problem: user related information optional end broad variety of json objects sent server, e.g.

1) {(name: 'fooman', email: 'foo@man.com')} 2) {(name: 'fooman', email: 'foo@man.com', adress:'fooadress')} 3) {(name: 'fooman', email: 'foo@man.com', hasdog:'true')} 4) {(name: 'fooman', email: 'foo@man.com', location: 'footown')} 

on server side, end checking every possible json structure update user's document using appropriate mongoose instruction like:

user.update({ _id: userid}, {name: json.name, email: json.email}) ->for case 1  user.update({ _id: userid}, {name: json.name, email: json.email, hasdog: true}) ->for case 3 

as can see, leads me ugly , redundant code. hoping architecture advice of how avoid this.

you can build update object programmatically pulling valid (whitelisted) fields request:

var request = {name: 'fooman', email: 'foo@man.com', hasdog: true, password: 'hack'}; var whitelist = ['name', 'email', 'address', 'hasdog', 'location']; var update = {};  // add whitelisted fields in request update object. (var ix in whitelist) {     var field = whitelist[ix];     if (request.hasownproperty(field)) {         update[field] = request[field];     } } user.update({ _id: userid }, update);