geoQuery的不同值在Mongo中有效，但在Spring中无效

Question

虽然这适用于mongo：

> db.collection.distinct( "key", {"position":{$geoWithin:{$box: [[-6.8, 36.7], [-0.5, 43.8]]}}} )
> [ "A", "B" ]

在春天返回一个错误

Criteria criteria = Criteria.where("position").within(box);
        Query query = new Query();
        query.addCriteria(criteria);
 List<String> result = mongoOperations.getCollection("collection")
                .distinct("key", query.getQueryObject());

java.lang.IllegalArgumentException：无法在org.bson.BasicBSONEncoder._putObjectField（BasicBSONEncoder.java:299）〜[mongo-java-driver-2.14.3]中序列化org.springframework.data.mongodb.core.query.GeoCommand类。 .jar：na] at org.bson.BasicBSONEncoder.putObject（BasicBSONEncoder.java:194）〜[mongo-java-driver-2.14.3.jar：na] at org.bson.BasicBSONEncoder._putObjectField（BasicBSONEncoder.java:255 ）org.bson.BasicBSONEncoder.putObject（BasicBSONEncoder.java:194）〜[mongo-java-driver-2.14.3.jar：na .bson.BasicBSONEncoder._putObjectField（BasicBSONEncoder.java:255）〜[mongo-java-driver-2.14.3.jar：na] at org.bson.BasicBSONEncoder.putObject（BasicBSONEncoder.java:194)~ [mongo-java-驱动程序-2.14.3.jar：na] at org.bson.BasicBSONEncoder.putObject（BasicBSONEncoder.java:136）〜[mongo-java-driver-2.14.3.jar：na] at com.mongodb.DefaultDBEncoder.writeObject（在DB.mongodb.OutMessage.putObject（OutMessage.java:289）的DefaultDBEncoder.java:36）〜[mongo-java-driver-2.14.3.jar：na] 〜[mongo-java-driver-2.14.3.jar：na] at com.mongodb.OutMessage.writeQuery（OutMessage.java:211）〜[mongo-java-driver-2.14.3.jar：na] at com。 mongodb.OutMessage.query（OutMessage.java:86）〜[mongo-java-driver-2.14.3.jar：na]

Answer 1

我确实看到需要直接使用集合的操作来完成MongoDB Java驱动程序API。然而Query.getQueryObject()不能直接与底层驱动程序一起使用，因为它被QueryMapper转换。现在，您可以尝试自己进行映射。

QueryMapper mapper = new QueryMapper(mongoOperations.getConverter());
org.bson.Document mappedQuery = mapper.getMappedObject(query.getQueryObject(), Optional.empty());

List<String> result = template.getCollection("collection")
    .distinct("key", mappedQuery, String.class)
    .into(new ArrayList<>());

还有DATAMONGO-1761（艰难仍然开放）寻求增加对distinct的支持MongoOperations。

Answer 2

我甚至无法编译@Christoph Strobl代码！

我终于使用mongo-java-driver来获取不同的值：

    MongoClient mongoClient = new MongoClient();
    MongoDatabase database = mongoClient.getDatabase(dbName);
    MongoCollection<org.bson.Document> collection = database.getCollection(COLLECTION);
    Bson query = Filters.geoWithinBox("position", 
            x1, y1, x2, y2);

    DistinctIterable<String> resultList = collection.distinct("key", query, String.class);

    Set resultSet = new HashSet();
    resultList.forEach(new Block<String>() {
        @Override
        public void apply(final String result) {
            resultSet.add(result);
        }
    });

    return resultSet;