Code that I want to execute by MongoTemplate:
{
$merge: {
into: 'someCollection',
on: "_id",
whenMatched: 'merge',
whenNotMatched: 'discard'
}
}
I did not find any suitable methods that allow me to describe $merge stage, have doubts if Spring Data MongoDB even supports this stage?
Yes, Spring Data MongoDB have support for $merge stage.
Your code can be executed by MongoTemplate following way.
MergeOperation mergeOperation = Aggregation.merge()
.intoCollection("someCollection")
.on("_id")
.whenMatched(MergeOperation.WhenDocumentsMatch.mergeDocuments())
.whenNotMatched(MergeOperation.WhenDocumentsDontMatch.discardDocument())
.build();
Use this mergeOperation with mongoTemplate.