Jakson custom serializer for list of objects - json

Question

I have a custom jackson serializer, and it works for serializing single pojos. Im trying to serialize a list of objects. Without the custom serializer I can just do:
public List<Sale> getAllSales() {
return saleRepository.getAll();
}
which works fine, but I want to return a very specific set of data, so I made a custom serializer, which also works but only for single objects:
public Sale getSale(int id) {
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(Sale.class, new SaleSerializer());
mapper.registerModule(module);
Sale sale = saleRepository.findById(1).orElse(null);
return mapper.writeValueAsString(sale);
}
How do I do the implement the custom serializer for a list of objects?

Answer 1

I'm not sure if this is the best way to do this, but I ended up doing it this way.
public ArrayNode getAllSalesToday() throws JsonProcessingException {
LocalDate localDate = LocalDate.now();
LocalDateTime startOfDay = localDate.atStartOfDay();
LocalDateTime endOfDay = localDate.atTime(LocalTime.MAX);
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(Sale.class, new SaleSerializer());
mapper.registerModule(module);
List<Sale> saleList = saleRepository.getAllByInitialDepositDateIsBetween(startOfDay,endOfDay);
ArrayNode arrayNode = mapper.createArrayNode();
for (Sale sale: saleList){
String x = mapper.writeValueAsString(sale);
JsonNode jsonNode = mapper.readTree(x);
arrayNode.add(jsonNode);
}
return arrayNode;
}