Spring Data MongoDB:如何描述aggregation $merge with Spring aggre

Question

我想由MongoTemplate执行的代码:

{
$merge: {
into: 'someCollection',
on: "_id",
whenMatched: 'merge',
whenNotMatched: 'discard'
}
}

我没有找到任何合适的方法来描述$merge阶段，有疑问Spring Data MongoDB是否支持这个阶段?

Answer 1

是，Spring Data MongoDB支持$merge阶段。您的代码可以通过MongoTemplate执行如下方式。

MergeOperation mergeOperation = Aggregation.merge()
.intoCollection("someCollection")
.on("_id")
.whenMatched(MergeOperation.WhenDocumentsMatch.mergeDocuments())
.whenNotMatched(MergeOperation.WhenDocumentsDontMatch.discardDocument())
.build();

使用mergeOperation和mongoTemplate。