【问题标题】:org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.springframework.data.mongodb.core.query.GeoCommandorg.bson.codecs.configuration.CodecConfigurationException:找不到类 org.springframework.data.mongodb.core.query.GeoCommand 的编解码器
【发布时间】:2018-11-01 14:55:13
【问题描述】:

我使用聚合如下:

    final List<AggregationOperation> aggregations = new ArrayList<>();
    Polygon polygon = new Polygon(new Point(-26.28125, 42.19231862526141), new Point(100.28125, 64.7157757187955),
            new Point(100.28125, 42.19231862526141), new Point(-26.28125, 64.7157757187955));
    AggregationOperation match = new MatchOperation(Criteria.where("location").within(polygon));
    aggregationOperations.add(match);
    aggregations.add(project("_id", "location","distance",User.COLLECTION_NAME)
            .and("$geoHash").substring(0,slice).as("geo"));
    aggregations.add(group("geo").count().as("count")
            .avg("location.lng").as("lon")
            .avg("location.lat").as("lat")
            .first(User.COLLECTION_NAME).as(User.COLLECTION_NAME));
    final Aggregation aggregation = newAggregation(aggregations);
    AggregationResults<ClusteredLocation> groupResults =
            mongoTemplate.aggregate(aggregation, UserLocation.COLLECTION_NAME, ClusteredLocation.class);
    return groupResults.getMappedResults();

正在创建的聚合如下: { "aggregate" : "collection", "pipeline" : [ { "$match" : { "location" : { "$geoWithin" : { "$java" : org.springframework.data. mongodb.core.query.GeoCommand@d502fd15 } } },{“$lookup”:{“from”:“users”,“localField”:“_id”,“foreignField”:“_id”,“as”:“用户“}},{“$project”:{“_id”:1,“位置”:1,“距离”:1,“用户”:1,“geo”:{“$substr”:[“$geoHash ", 0, 3] } } }, { "$group" : { "_id" : "$geo", "count" : { "$sum" : 1 }, "lon" : { "$avg" : " $location.lng" }, "lat" : { "$avg" : "$location.lat" }, "users" : { "$first" : "$users" } } } ] }

我得到如下异常:

org.bson.codecs.configuration.CodecConfigurationException:找不到类 org.springframework.data.mongodb.core.query.GeoCommand 的编解码器。

我在匹配操作中做错了吗?

【问题讨论】:

  • 这看起来很像一个错误。似乎Criteria 没有通过QueryMapper 将非MongoDB 简单类型传递给驱动程序。我创建了DATAMONGO-1986 来调查这里发生的事情。

标签: mongodb spring-data-mongodb


【解决方案1】:

您可以通过使用TypedAggregation 或通过显式提供输入类型来解决此问题。两种策略都在模板中强制执行查询映射。

TypedAggregation agg = newAggregation(UserLocation.class, aggregations);
mongoTemplate.aggregate(agg, COLLECTION_NAME, ClusteredLocation.class);

// or

Aggregation agg = newAggregation(aggregations);
mongoTemplate.aggregate(agg, UserLocation.class, COLLECTION_NAME, ClusteredLocation.class);

【讨论】:

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