Serializers for GeoJson classes [DATAMONGO-2336]

[spring-projects-issues]

kubahorak opened DATAMONGO-2336 and commented

In GeoJsonModule there are deserializers present.

See Line 55

These allow deserialization from RFC7946 format to GeoJson classes.
 

Serializing GeoJsonMultiPoint (applies also to other GeoJson classes) with Jackson using GeoJsonModule leads to following JSON:

 

{
    "coordinates": [
        {
            "coordinates": [
                13.306671,
                52.475053
            ],
            "type": "Point",
            "x": 13.306671,
            "y": 52.475053
        },
        {
            "coordinates": [
                13.3063,
                52.470674
            ],
            "type": "Point",
            "x": 13.3063,
            "y": 52.470674
        }
    ],
    "type": "MultiPoint"
}

 

RFC7946 Section 3.1.3, Section 3.1.1 and Appendix A.4 specifies that the coordinates should be an array of numbers, not a list of Points.

Expected result would be:

{
    "coordinates": [
        [
            13.306671,
            52.475053
        ],
        [
            13.3063,
            52.470674
        ]
    ],
    "type": "MultiPoint"
}

To fix this, I suggest adding serializers to GeoJsonModule.

See following test case:

 

GeoJsonMultiPoint multipoint = new GeoJsonMultiPoint(
    new Point(0, 0),
    new Point(1, 1));
String result = objectMapper.writeValueAsString(multipoint);
assertThat(result).isEqualToIgnoringWhitespace(
    "{ \"type\": \"MultiPoint\", \"coordinates\": [[0.0, 0.0], [1.0, 1.0]] }"
);

 

 

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Affects: 2.1.10 (Lovelace SR10)

[christophstrobl]

Resolved for 3.2 via #3517