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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: 2.10.0+569905ff5e778c38ea19d9d0392496a83e1704ed
public enum MergeStageWhenMatched
  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