Spring Data MongoDB and Bulk Update

Question

I am using Spring Data MongoDB and would like to perform a Bulk Update just like the one described here: http://docs.mongodb.org/manual/reference/method/Bulk.find.update/#Bu

Answer 1

public  void bulkUpdate(String collectionName, List documents, Class tClass) {
    BulkOperations bulkOps = mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, tClass, collectionName);
    for (T document : documents) {
        Document doc = new Document();
        mongoTemplate.getConverter().write(document, doc);
        org.springframework.data.mongodb.core.query.Query  query = new org.springframework
            .data.mongodb.core.query.Query(Criteria.where(UNDERSCORE_ID).is(doc.get(UNDERSCORE_ID)));
        Document updateDoc = new Document();
        updateDoc.append("$set", doc);
        Update update = Update.fromDocument(updateDoc, UNDERSCORE_ID);
        bulkOps.upsert(query, update);
    }
    bulkOps.execute();
}

Spring Mongo template is used to perform the update. The above code will work if you provide the _id field in the list of documents.