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MergeStageWhenMatched Enumeration

The behavior of $merge is a result document and an existing document in the collection have the same value for the specified on field(s).

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.21.0+5a9c3311e158910b88195f290e6d4b1b2715d2b2
Syntax
public enum MergeStageWhenMatched
Members
  Member nameValueDescription
Replace0 Replace the existing document in the output collection with the matching results document.
KeepExisting1 Keep the existing document in the output collection.
Merge2 Merge the matching documents (similar to the $mergeObjects operator).
Fail3 Stop and fail the aggregation. Any changes to the output collection from previous documents are not reverted.
Pipeline4 Use an aggregation pipeline to update the document in the collection.
See Also