MongoDB Object key with ES6 template string

Question

I'm trying to update an array in my collection with this:

 var str = "list.0.arr";
    db.collection('connect').update({_id: id}, {$push:  { `${str}`: item}});

This exact string works just fine if I do it like this:

db.collection('connect').update({_id: id}, {$push:  { "list.0.arr": item}});

This is to show that it works, but It's throwing an error Unexpected token when I use the first solution.

My question is, how can I get the top solution to work as the Object key?

Community · Accepted Answer · 2017-05-23 12:24:31Z

6

Template literals cannot be used as key in an object literal. Use a computed property instead:

db.collection('connect').update({_id: id}, {$push: {[str]: item}}); 
//                                                  ^^^^^

See also Using a variable for a key in a JavaScript object literal

edited May 23, 2017 at 12:24

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answered Jun 21, 2015 at 21:24

Felix Kling

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2 Comments

hackel Over a year ago

This does not work. It gives: SyntaxError: Unexpected token [. I suspect mongo doesn't support this syntax. (Using version 2.6.11)

Felix Kling Over a year ago

@hackel: That has nothing to do with MongoDB, rather with the Node version you are using. See node.green for which features are supported in each version.

chridam · Accepted Answer · 2015-06-21 21:16:09Z

2

Create the update document with the string as key prior to using it in the update:

var str = "list.0.arr",
    query = { "_id": id },
    update = { "$push": {} };
update["$push"][str] = item;
db.collection('connect').update(query, update);

answered Jun 21, 2015 at 21:16

chridam

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1 Comment

Abdullah Alkurdi Over a year ago

Thanks a lot, this worked for me after I was almost gave up , var Now = new Date(); var currMonth = Now.getMonth(); var currYear = Now.getFullYear(); console.log(currYear, currMonth); var query = {shareId: share}, inc = { "$inc": {} }; inc["$inc"][interactions.views.${currYear}.${currMonth}] = 1 ; ShareStat.findOneAndUpdate(query, inc);

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