Concatanate Variable And Query MongoDB

Question

This is my working query:

collection.update({ _id: '124'}, {$addToSet: {'data.dropdowns.accessRoles': req.body.newItem}}, function(err, results) {
                   //
                });

I want to change data.dropdowns.accessRoles according to input string. Input variable is stored in req.body.listName. I tried this, but it didn't work:

{$addToSet: {'data.dropdowns.req.body.listName': req.body.newItem}}

Any ideas?

var setValue = {}; setValue['data.dropdowns' + req.body.listName] = 0; I defined path like this. How do I use this in my query? {$addToSet: {setValue: req.body.newItem}} doesn't work. I don't know how to use $set. — user3803096
– user3803096, Commented Jul 21, 2014 at 19:32

JohnnyHK · Accepted Answer · 2014-07-21 19:40:01Z

1

Assembly your $addToSet object programmatically:

var addToSet = {};
addToSet['data.dropdowns.' + req.body.listName] = req.body.newItem;
collection.update({ _id: '124'}, {$addToSet: addToSet}, function(err) {...});

answered Jul 21, 2014 at 19:40

JohnnyHK

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