how can I parse an array of objects in my node.js and mongodb query?

Question

In my webservice I was passing array of strings and then I was parsing it like this:

var users = req.body.users;

if (users) {
   var user = users.split(',');
   query.$and.push({"device_id": {$nin: user}});
}

but now my requirement changed and instead of strings I'm passing array like this:

"users": (
{
    "device_id" = "XXX";
    "display_name" = XXX;
    "facebook_username" = XXX;
    username = XXX;
},
{
    "device_id" = "YYY";
    "display_name" = YYY;
    "facebook_username" = YYY;
    username = YYY;
}
)

like before - I want to filter out all records that contain given device_ids. How can I modify my code so that it iterates over array (and take into consideration specific fields) instead of strings?

Bastiaanus · Accepted Answer · 2016-12-09 19:54:27Z

1

Assuming that req.body.users is an array try the following:

var users = req.body.users;
var excludedDeviceIds = [ ];

for(var i in users) {
    excludedDeviceIds.push(users[i]['device_id']);
}

query.$and.push({ 'device_id': { $nin: excludedDeviceIds } });

Edit:

If your environment supports ES6 you can also try:

query.$and.push({ 
    'device_id': { 
        $nin: users.map(user => user['device_id']) 
    } 
});

answered Dec 9, 2016 at 19:54

Bastiaanus

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1 Comment

user3766930 Over a year ago

thank you very much, it's all clear now! Unfortunately I had to rewrite (mostly expand) my functionality and now I face different problem, I set up additional question here stackoverflow.com/questions/41071134/… could you take a look? maybe that's sth you would know about, thanks!

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