How to deal with Optional Paths answer

[json-path]

How to deal with Optional Paths answer

[kallestenflo]

Please ask questions at the google group https://groups.google.com/forum/#!forum/jsonpath

Your JSON is not valid. I will answer based on the JSON below

[
    {
        "id": "1",
        "name": "Test",
        "location": {
            "address": "Street 1",
            "crossStreet": "Street 2"
        }
    },
    {
        "id": "1",
        "name": "Test",
        "location": {
            "address": "Street 1"
        }
    }
]

The default configuration will return

List<String> crossStreets = JsonPath.parse(json).read("$[*].location.crossStreet");
Assertions.assertThat(crossStreets).containsExactly("Street 2");

If you want results from location objects that does not define crossStreet you must tweak the configuration

Configuration conf = Configuration.defaultConfiguration()
   .addOptions(Option.DEFAULT_PATH_LEAF_TO_NULL);

List<String> crossStreets = JsonPath.using(conf)
   .parse(json)
   .read("$[*].location.crossStreet");
Assertions.assertThat(crossStreets).containsExactly("Street 2", null);

If this is your preferred default behaviour you can configure this when you bootstrap your application.

Configuration.setDefaults(new Configuration.Defaults() {
    private final Set<Option> options = EnumSet.of(Option.DEFAULT_PATH_LEAF_TO_NULL);

    @Override
    public JsonProvider jsonProvider() {
        return new JsonSmartJsonProvider(); //json-smart is not thread safe
    }

    @Override
    public Set<Option> options() {
        return options;
    }

    @Override
    public MappingProvider mappingProvider() {
        return new JsonSmartMappingProvider();
    }
});

Hope this answers your question.

[avaz]

Hi @kallestenflo, thanks for reply.

I already have tried your suggestion and it's not working too.
I've posted a more completed question in GoogleGroups: https://groups.google.com/forum/#!topic/jsonpath/yPurMLMbB2Y

If you can see there I will be glad.

Thanks for your attention.

Regards.

[manusan]

For some reason, tweaking configuration on documentation (tweaking-configuration) does not work as expected, use this:
Configuration conf = Configuration.builder().options(Option.DEFAULT_PATH_LEAF_TO_NULL).build();