object WhenMatched
The behavior of $merge
if a result document and an existing document in the collection have the same value for the specified on
field(s).
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val
FAIL: WhenMatched
Stop and fail the aggregation operation.
Stop and fail the aggregation operation. Any changes to the output collection from previous documents are not reverted.
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val
KEEP_EXISTING: WhenMatched
Keep the existing document in the output collection.
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val
MERGE: WhenMatched
Merge the matching documents
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val
PIPELINE: WhenMatched
An aggregation pipeline to update the document in the collection.
An aggregation pipeline to update the document in the collection.
- See also
#whenMatchedPipeline(List)
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val
REPLACE: WhenMatched
Replace the existing document in the output collection with the matching results document.
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