How can i extract a DTO from multiple tables in a micronaut application in Kotlin? - kotlin

Question

I am trying to extract into a list of DTO from multiple tables using a Native query but the documentation is just not helping.
Here are the two entity classes :
#Entity
#Table(name="addresses")
data class Addresses (
#Id
#Column(name="address_id")
val address_id:Long=0,
#Column(name="address_name")
val address_name:String="",
#OneToOne
#JoinColumn(name = "emp_id")
private var pos: Employee?
)
import com.fasterxml.jackson.annotation.JsonManagedReference
import javax.persistence.*
#Entity
#Table(name = "employee")
data class Employee (
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "emp_id")
val emp_id:Long=0,
#Column(name = "emp_name")
val emp_name:String="",
#OneToOne(mappedBy = "pos", cascade = [CascadeType.ALL],
orphanRemoval = true, fetch = FetchType.EAGER)
private var posAddress: Addresses,
)
I want to use this CustomDTO to extract the result set
#Introspected
class CustomDTO (
val emp_id:Long?,
val emp_name:String?,
val address_name:String?
)
So i will have to use a native query in order to do that :
#Repository
interface EmployeeRepository : JpaRepository<Employee, Long> {
#Join(value="addresses", type = Join.Type.FETCH)
#Query("select e.emp_id,emp_name,a.address_name from employee e join addresses a on a.emp_id=e.emp_id")
fun getResult():List<CustomDTO>
}
But when i try to run it , i get an error :
Property address_name is not present in entity: com.example.domain.Employee
Any ideas how i can resolve this ?

Answer 1

For anyone struggling :
#Query("select new com.packagename.DeliverySlotDto(ts.active, st.name) from TemplateSlot ts \n" +
" inner join DeliveryServiceType st on st.id=ts.serviceTypeId where ts.posId = :posId ")
fun findServiceTypeAndStatusDto(posId:Long):List<DeliverySlotDto>