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APPLIES TO:
MongoDB vCore
The $mergeObjects operator is used to combine multiple documents into a single document. This operator is useful in aggregation pipelines when you need to merge fields from different documents or add another field to an existing document. The behavior of $mergeObjects is to overwrite fields in the target document with fields from the source document when there are conflicts.
{ $mergeObjects: [ <document1>, <document2>, ... ] }
| Description | |
|---|---|
document1, document2 |
These documents are targeted for merge. The documents can be specified as field paths, subdocuments, or constants. |
- Review options for Migrating from MongoDB to Azure Cosmos DB for MongoDB (vCore)
- Read more about Feature compatibility with MongoDB