Updating a document based on another field

[steevej (Steeve Juneau)]

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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…