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MongoDB Query Language (MQL) Object Expression Operators

Object expression operators manipulate and transform document objects within aggregation expressions. These operators enable you to merge documents, convert objects to arrays and vice versa, set field values, and perform other document-level transformations.

$mergeObjects

The $mergeObjects operator merges multiple documents into a single document

$objectToArray

The objectToArray command is used to transform a document (object) into an array of key-value pairs.

$setField

The setField command is used to add, update, or remove fields in embedded documents.