LoganSquare not including field name on generated Json

Question

I have a class DbRecord

public class DbRecord {


    @JsonField(name="on_duties")
    List<OnDutyElement> onDuties;

    @JsonField(name = "date_time")
    DateTime dateTime;

When I try to serialize an object of this class, the LoganSquare doesn't include the dateTime field.

Generated JSON: {:"2015-12-21T11:32:17.503-05:00","on_duties":[{...everything normal from here

this looks more like a bug in LoganSquare then in you code. you should probably submit a bugreport on github. — Aegis, Dec 21 '15 at 17:01

score 4 · Answer 1 · answered Feb 05 '16 at 13:02

If all JSON Field names are lowercase with underscore you can define fieldNamingPolicy like that.

@JsonObject(fieldNamingPolicy = JsonObject.FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
public class DbRecord {


@JsonField
List<OnDutyElement> onDuties;

@JsonField
DateTime dateTime;

You need also to have TypeConverter for DateTime if you haven't done that already, LoganSquare allows you now to define the TypeConverter in the JsonField Annotation like that

 @JsonField(typeConverter = DateTimeConverter.class)
DateTime time;

and the DateTimeConverter

public class DateTimeConverter implements TypeConverter<DateTime> {
@Override
public DateTime parse(JsonParser jsonParser) throws IOException {
    String dateString = jsonParser.getValueAsString(null);
    try {
        DateTime dateTime = new DateTime(dateString);
        return dateTime.changeTimeZone(TimeZone.getTimeZone("UTC"), TimeZone.getDefault());
    } catch (RuntimeException runtimeException) {
        runtimeException.printStackTrace();
        return null;
    }
}

@Override
public void serialize(DateTime object, String fieldName, boolean writeFieldNameForObject, JsonGenerator jsonGenerator) throws IOException {
    jsonGenerator.writeStringField(fieldName, object.format("YYYY-MM-DDThh:mm:ss"));
}

}

score 3 · Accepted Answer · answered Dec 21 '15 at 17:08

3

Probably, there is a bug. Write your own TypeConverter that extends DateTypeConverter, override serialize() method explicit pass writeFieldName with value true.

This will force the type converter write field name to the writer.

answered Dec 21 '15 at 17:08

Nikola Despotoski

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1

I was using `jsonGenerator.writeString` instead of `jsonGenerator.writeStringField` in my `TypeConverter`. – giannisf Dec 21 '15 at 17:42

LoganSquare not including field name on generated Json

2 Answers2