How to update a SpringData MongoDB document inside a loop?

Question

I have the POJO mapped to SpringData MongoDB Document

@Document(collection = “cacheVersion” ) 
public class CacheVersionBean {
    private boolean active = true;
    ...

Then I find the list in the MongoDB and try modification of the MongoDb document inside the list using MongoTemplate save:

Query query = new Query().addCriteria(Criteria.where("active").is(true));
List<CacheVersionBean> versionBeans = mongoTemplate.find(query, CacheVersionBean.class);
for (CacheVersionBean cacheVersionBean: versionList)
{
    cacheVersionBean.setActive(false);
    mongoTemplate.save(cacheVersionBean);
    ...

However, instead of modifying the document in the database this code creates the new Document. What is the easiest way for updating?

robjwilkins · Accepted Answer · 2015-08-20 14:43:09Z

1

I think you need to add an @Id annotated field (String or BigInteger) to your POJO (or simply a field named 'id' of those types). Spring will use this and then understand that the document you are saving is already in the database, and update it rather than creating a new document:

http://docs.spring.io/spring-data/data-document/docs/current/reference/html/#d0e1508

answered Aug 20, 2015 at 14:43

robjwilkins

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