Question

我正在尝试使用Morphia将GeoJson Polygon对象存储到Mongodb。请注意，GeoJson Polygon坐标必须是3级深度数组，如下所示。

{
  type: "Polygon",
  coordinates: [ [ [ 0 , 0 ] , [ 3 , 6 ] , [ 6 , 1 ] , [ 0 , 0  ] ] ]
}

以下是我的实体课程。

static class Loc {
        private final String type = "Polygon";
        private ArrayList<ArrayList<Double[]>> coordinates = new ArrayList<ArrayList<Double[]>>();
        public ArrayList<ArrayList<Double[]>> getCoordinates() {
            return coordinates;
        }
        public void setCoordinates(ArrayList<Double[]> coordinates) {
            this.coordinates.add(coordinates);

        }
    }

当我存储它时，Morphia给了我以下例外。

Exception in thread "main" org.mongodb.morphia.mapping.MappingException: Error mapping field:com.utils.JavaUtils$Poly.loc
    at org.mongodb.morphia.mapping.Mapper.toDBObject(Mapper.java:983)
    at org.mongodb.morphia.mapping.Mapper.toDBObject(Mapper.java:593)
    at org.mongodb.morphia.DatastoreImpl.entityToDBObj(DatastoreImpl.java:1359)
    at org.mongodb.morphia.DatastoreImpl.save(DatastoreImpl.java:1279)
    at org.mongodb.morphia.DatastoreImpl.save(DatastoreImpl.java:775)
    at org.mongodb.morphia.DatastoreImpl.save(DatastoreImpl.java:758)
    at com.utils.JavaUtils.polygonizeAndSave(JavaUtils.java:105)
    at com.examples.MainExample$$anonfun$main$4.apply(MainExample.scala:71)
    at com.examples.MainExample$$anonfun$main$4.apply(MainExample.scala:71)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
    at com.examples.MainExample$.main(MainExample.scala:71)
    at com.examples.MainExample.main(MainExample.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:736)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)


     Caused by: org.mongodb.morphia.mapping.MappingException: Error mapping field:com.utils.JavaUtils$Poly$Loc.coordinates
    at org.mongodb.morphia.mapping.Mapper.toDBObject(Mapper.java:983)
    at org.mongodb.morphia.mapping.Mapper.toDBObject(Mapper.java:593)
    at org.mongodb.morphia.mapping.EmbeddedMapper.toDBObject(EmbeddedMapper.java:98)
    at org.mongodb.morphia.mapping.Mapper.writeMappedField(Mapper.java:875)
    at org.mongodb.morphia.mapping.Mapper.toDBObject(Mapper.java:981)
    ... 21 more 


    Caused by: java.lang.IllegalArgumentException: BasicBSONList can only work with numeric keys, not: [className]
    at org.bson.types.BasicBSONList._getInt(BasicBSONList.java:168)
    at org.bson.types.BasicBSONList._getInt(BasicBSONList.java:160)
    at org.bson.types.BasicBSONList.removeField(BasicBSONList.java:117)
    at org.mongodb.morphia.mapping.EmbeddedMapper.writeCollection(EmbeddedMapper.java:243)
    at org.mongodb.morphia.mapping.EmbeddedMapper.toDBObject(EmbeddedMapper.java:90)
    at org.mongodb.morphia.mapping.Mapper.writeMappedField(Mapper.java:875)
    at org.mongodb.morphia.mapping.Mapper.toDBObject(Mapper.java:981)
    ... 25 more

Answer 1

有同样的问题并得出以下结论。您应该使用Morphia为您提供的功能，而不是使用您的自定义类。主要是你可以像这样创建多边形：

import org.mongodb.morphia.geo.Point;
import org.mongodb.morphia.geo.Polygon;
import org.mongodb.morphia.geo.GeoJson;

public class Main {
    private static PlaceDAO placeDAO = ...;

    public static void main(String[] args) {            
        Place place = new Place();

        Point point1 = GeoJson.point(0.0, 0.0);
        Point point2 = GeoJson.point(0.0, 0.1);
        Point point3 = GeoJson.point(0.1, 0.0);
        Point point4 = GeoJson.point(0.0, 0.0);
        Polygon location = GeoJson.polygon(point1, point2, point3, point4);

        place.setLocation(location);

        placeDAO.save(place);
        List<Place> places = shopDAO.find().asList();
    }
}

您可以创建2dsphere索引并执行$ intersect查询没问题。

无法使用Morphia和Java在Mongodb中存储GeoJson Polygon对象

1 个答案: