How to map query result to List<Object> in R2DBC? - oracle

Question

I am trying to migrate my JDBC based application to R2DBC, however I struggle with List based objects. How can I map the result from query to "List" field?
I was using ResultSetExtractor, but in R2DBC there is no option like that so I try to do it manually. I use DatabaseClient with manual mapping, however this mapping does not work with List type fields.
public class Employee {
private Long id;
private String name;
private String surname;
private List\<Account\> accounts;
}
public class Account {
private String employeeId;
private String accountNumber;
}
public class EmployeeRepository {
private final DatabaseClient databaseClient;
public static final BiFunction<Row, RowMetadata, Employee> EMPLOYEE_MAPPER =
(row, rowMetadata) -> Employee.builder()
.id(row.get("id", String.class))
.name(row.get("name", String.class))
.surname(row.get("surname", String.class))
.accounts(List.of(new Account((row.get("employeeId"), (row.get("accountNumber")))))
.build();
public Flux<Employee> findCardByPan(Long id) {
return databaseClient.sql("SELECT id, name, surname, a.accountNumber FROM employee e JOIN account a on e.id = a.employeeId WHERE e.id = :id")
.bind("id", id)
.map(EMPLOYEE_MAPPER)
.all();
}
}
Current response model:
[
{
"id": "1",
"name": "Test User",
"surname": "Test User",
"accounts": [
{
"employeeId": "1",
"accountNumber": "98034"
}
]
},
{
"id": "1",
"name": "Test User",
"surname": "Test User",
"accounts": [
{
"employeeId": "1",
"accountNumber": "12456"
}
]
}
]
Expected response model:
[
{
"id": "1",
"name": "Test User",
"surname": "Test User",
"accounts": [
{
"employeeId": "1",
"accountNumber": "98034"
},
{
"employeeId": "1",
"accountNumber": "12456"
}
]
}
]