How to use $mergeobjects in mongodb?

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This is the script am running in mongoshell to understand the usage of $mergeobjects operator in aggregation. I want to see the output from this operator($mergeobjects)
So than i can clearly understand the functionality of this operator.

but when run this script am getting below mentioned error.

2019-08-05T12:39:35.309+0530 E QUERY    [js] SyntaxError: missing ] after element list @(shell):2:17

Am new to mongodb.understanding this from SQL perspective.
Any solution on this error would be greatly appreciated.

What I have tried:

db.collection.aggregate([
    $mergeObjects: [ { _id: "$_id", first: "", last: "" }, "$name" ] 
])

Posted 4-Aug-19 21:16pm

Member 11337367

Updated 4-Aug-19 22:01pm

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Richard MacCutchan · Answer 1 · 2019-08-04T22:01:00

Solution 1

You have the square brackets and curly braces in the wrong places. See $mergeObjects (aggregation) — MongoDB Manual[^].

Posted 4-Aug-19 22:01pm

Richard MacCutchan

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Member 11337367 5-Aug-19 4:46am

from that link only i generated this script but still failing to execute the script.can you pls elaborate the issue?so that ill know where exactly it went wrong?

Richard MacCutchan 5-Aug-19 4:52am

Look where you are using square brackets and curly braces. According to the documentation you have them the wrong way round.