Predicate on a Map<String, String> field using spring-data-mongodb -

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as subject says, have problems query involving predicate on map<string, string> field.

i have following test case reproduces problem: 

  @test   public void testreferencespredicate() throws exception {              //cleans event collection             final dbcollection event = mongotemplate.getcollection("event");             event.drop();              final event anevent = new event();             //event has more fields              final map<string, string> somerefs = new hashmap<>();             somerefs.put("a", "b");             anevent.setreferences(somerefs);              final event save = this.eventrepository.save(anevent);              assertnotnull(save);              final booleanbuilder refpredicate = new booleanbuilder();              final map<string, string> references = new hashmap<>();             references.put("a", "b");              (final map.entry<string, string> stringobjectentry : references.entryset()) {                  final string key = stringobjectentry.getkey();                 final string value = stringobjectentry.getvalue();                  // doesn't work: refpredicate.and(qevent.event.references.contains(key, value));                 refpredicate.and(qevent.event.references.get(key).eq(value));              }              final pageable firstpage = new pagerequest(1, 1);             final page<event> = this.eventrepository.findall(refpredicate, firstpage);             assertnotnull(all);             assertequals(1, all.getcontent().size()); //the eventrepository this: public interface eventrepository extends mongorepository<event, objectid>,         querydslpredicateexecutor<event>,          }

when mongo logging stdout queries client performing, see following: 

2015-07-30t10:49:24.399+0200 query    [conn3] query some-db.event query: { references.a: "b" } plansummary: collscan ntoreturn:0 ntoskip:0 nscanned:0 nscannedobjects:1 keyupdates:0 writeconflicts:0 numyields:0 nreturned:1 reslen:207 locks:{ global: { acquirecount: { r: 2 } }, mmapv1journal: { acquirecount: { r: 1 } }, database: { acquirecount: { r: 1 } }, collection: { acquirecount: { r: 1 } } } 0ms

it seems query performed different query works mongo client: 

e = db.getcollection("event") e.find({ "references.a": "b" })

please note quotes around references.a, think used access nested json document.

has experienced already?

i on spring-data-mongodb-1.7.0.release on mongodb v3.0.4


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