Support for positional $ operator in Update

It seems that mongo-java-server does not support the positional operator $ when an update is performed. I’m trying to run the following update, but it does not work in my tests (it works when I run the actual code):

Query query = new Query();
query.addCriteria(Criteria.where("myArray").elemMatch(
	Criteria.where("identifier").is("theId").and("state").is("theState")));

Update update = new Update()
    .set("myArray.$.identifier", newId)
    .set("myArray.$.state", newState);

this.mongoTemplate.updateMulti(query, update, MyEntity.class);

The error message is: The positional operator did not find the match needed from the query.

Would it be possible to fix this? It would be nice, if I am able to use my already exiting test in the future 😉

[bwaldvogel]

Ok, thanks for this hint. I’ll try to have a closer look soon

[emillynge]

I’m also seeing this problem.

I think the issue may be caused by DefaultQueryMatcher.checkMatchesElemValues not recording lastPosition when looping:

        Collection<Object> list = (Collection<Object>) values;
        for (Object value : list) {
            if (checkMatchesValue(queryValue, value, false)) {
                return true;
            }
        }

It does so in DefaultQueryMatcher.checkMatchesAnyValue(Object queryValue, Collection<?> values) which is why your test isn’t failing.
In order to provoke the issue, you need to use $elemMatch in the query.