Question

我正在使用聚合如下：

    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： {＆＃34;聚合＆＃34; ：＆＃34; 集合＆＃34;，＆＃34;管道＆＃34; ：[{＆＃34; $ match＆＃34; ：{＆＃34; location＆＃34; ：{＆＃34; $ geoWithin＆＃34; ：{＆＃34; $ java＆＃34; ：org.springframework.data.mongodb.core.query.GeoCommand@d502fd15}}}}，{＆＃34; $ lookup＆＃34; ：{＆＃34;来自＆＃34; ：＆＃34;用户＆＃34;，＆＃34; localField＆＃34; ：＆＃34; _id＆＃34;，＆＃34; foreignField＆＃34; ：＆＃34; _id＆＃34;，＆＃34; as＆＃34; ：＆＃34;用户＆＃34; }，{＆＃34; $ project＆＃34; ：{＆＃34; _id＆＃34; ：1，＆＃34; location＆＃34; ：1，＆＃34;距离＆＃34; ：1，＆＃34;用户＆＃34; ：1，＆＃34; geo＆＃34; ：{＆＃34; $ substr＆＃34; ：[＆＃34; $ geoHash＆＃34;，0,3]}}}，{＆＃34; $ group＆＃34; ：{＆＃34; _id＆＃34; ：＆＃34; $ geo＆＃34;，＆＃34; count＆＃34; ：{＆＃34; $ sum＆＃34; ：1}，＆＃34; lon＆＃34; ：{＆＃34; $ avg＆＃34; ：＆＃34; $ location.lng＆＃34; }，＆＃34; lat＆＃34; ：{＆＃34; $ avg＆＃34; ：＆＃34; $ location.lat＆＃34; }，＆＃34;用户＆＃34; ：{＆＃34; $ first＆＃34; ：＆＃34; $ users＆＃34; }}}}}

例外我得到如下：

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

我在比赛中做错了吗？

Answer 1

您可以使用TypedAggregation或明确提供输入类型来解决此问题。这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);

org.bson.codecs.configuration.CodecConfigurationException：找不到类org.springframework.data.mongodb.core.query.GeoCommand

1 个答案: