Currently, I'm using Spring boot with DynamoDB and using DynamoDBMapper for all DB operation. Right now it's sorting in ascending order based on sort key(field name id). How can I sort in descending order based on sort key value?
Current code :
@Override
public PageImpl getCustomerOrders(Pageable pageable) {
List orders = new ArrayList<>();
Map eav = new HashMap();
DynamoDBScanExpression scanExpression = new DynamoDBScanExpression();
List exp = new ArrayList<>();
// filters
if (!exp.isEmpty())
scanExpression
.withFilterExpression(String.join(" AND ", exp)).withExpressionAttributeValues(eav);
PaginatedScanList scan = mapper.scan(Order.class, scanExpression);
int start = (int) pageable.getOffset();
int size = scan.size();
int end = (start + pageable.getPageSize()) > size ? size : (start + pageable.getPageSize());
if (start < size)
for (Order o : scan.subList(start, end)) {
orders.add(o);
}
return new PageImpl(orders, pageable, size);
}
After some googling, I found that I need to set ScanIndexForward to be true but still I'm confused that how can I achieve it with DynamoDBMApper?
Or should I need to use any low-level class like DynamoDB or AmazonDynamoDb?
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