Node Driver - How to updateMany Replace Array with last item in Array

[MaBeuLux88_xxx (Maxime Beugnet)]

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I don’t even know how to reuse the value of an existing field in the document without the aggregation framework. Maybe there is a way but the aggregation framework is really like super powers!

Using MongoDB without the aggregation framework is like using a motorbike without putting gas in it. ! You will eventually be able to get to your destination but this is going to require a lot more effort and it won’t be efficient .

I did some research before sending this answer and there is a way to do this with an “update” operation. But you will also need the aggregation pipeline which can now be used in the update operations… . So it’s aggregation or aggregation basically.

How can we assign one field value to another?

Hi @Dhara_Pathak, Starting from MongoDB 4.2 you can perform Updates with an Aggregation Pipeline. An aggregation pipeline enables more expressive updates including calculated fields and references to other field values in the same document. You haven’t provided an example document, but based on your description I assume something like the following would be representative: db.mydata.insert({ invoices: { services: { price: NumberDecimal("4.99") } } }) Updat…

Cheers,
Maxime.