addFields() function

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addFields() function

Creates an $addFields pipeline stage for adding computed fields.

This is equivalent to MongoDB's $addFields aggregation operator. Adds new fields or replaces existing fields with computed values.

Signature:

declare function addFields(fields: Record<string, any>): SetStage;

Parameters

Parameter

Type

Description

fields

Record<string, any>

Object mapping field names to computed expressions

Returns:

SetStage

An $addFields stage

Example

const stage = addFields({
    isOwner: { $eq: ['$role', 'owner'] },
    fullName: { $concat: ['$firstName', ' ', '$lastName'] },
    computedAt: new Date().toISOString()
});
// { $addFields: { isOwner: ..., fullName: ..., computedAt: ... } }