Kotlin, map a class to another class - kotlin

Question

I'm creating an API rest and I need it when I do "find ALL" instead of fetching all the data, I just fetch a few. With Java I did it this way:
#GetMapping(value = "/pagina")
public ResponseEntity<Page<PersonFindDTO>> findAll(
#RequestParam(value = "page", defaultValue = "0") Integer page,
#RequestParam(value = "linesPerPage", defaultValue = "24") Integer linesPerPage,
#RequestParam(value = "order", defaultValue = "ASC") String order,
#RequestParam(value = "orderBy", defaultValue = "name") String orderBy) {
var person = personService.findAll(page, linesPerPage, order, orderBy);
var personFindDto = person.map(PersonFindDTO::new);
return ResponseEntity.ok().body(personFindDTO);
}
With Kotlin, I'm trying this way:
#GetMapping(value = ["/{companyId}/{active}"])
override fun findAll(
#RequestParam(value = "page", defaultValue = "0") page: Int,
#RequestParam(value = "linesPerPage", defaultValue = "24") linesPerPage: Int,
#RequestParam(value = "order", defaultValue = "ASC") order: String,
#RequestParam(value = "orderBy", defaultValue = "tradeName") orderBy: String,
#PathVariable companyId: Long, #PathVariable active: Boolean): ResponseEntity<Page<Any>> {
val lp = service.findAll(page, linesPerPage, order, orderBy, companyId, active)?.let {
it.map {
fun LegalPerson.toLegalPersonMPage() = LegalPersonMPage(id = it.id,
tradeName = it.tradeName, companyName = it.companyName, cnpj = it.cnpj)
}
}
return ResponseEntity.ok().body(lp)
}
But the return is always empty. Could anyone help? Please.
UPDATE:
My LegalPerson Class
data class LegalPerson(
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
override var id: Long,
#Column(nullable = false)
val companyId: Long,
#Column(nullable = false)
var active: Boolean,
#Column(nullable = false, length = 100)
val tradeName: String,
#Column(nullable = false, length = 100)
val companyName: String,
#Column(nullable = false, length = 100)
val email: String,
#Column(nullable = false, length = 18)
val cnpj: String,
#Column(length = 15)
val stateRegistration: String,
#Column(length = 15)
val municipalRegistration: String,
#Column(nullable = false)
val openingDate: LocalDate,
#Column(nullable = false)
val address: Long,
#ElementCollection(fetch = FetchType.EAGER)
#CollectionTable(name = "phone", schema = "legal_person")
val phones: List<Long>
)
My LegalPersonMPage class
data class LegalPersonMPage(
val id: Long,
val tradeName: String,
val companyName: String,
val cnpj: String
) {
}

Answer 1

The function LegalPerson.toLegalPersonMPage() is defined but never called. To make this clearer define the function outside of map {...} and call it inside of map {...}.
fun LegalPerson.toLegalPersonMPage() = LegalPersonMPage(id = this.id,
tradeName = this.tradeName, companyName = this.companyName, cnpj = this.cnpj)
#GetMapping(value = ["/{companyId}/{active}"])
override fun findAll(
#RequestParam(value = "page", defaultValue = "0") page: Int,
#RequestParam(value = "linesPerPage", defaultValue = "24") linesPerPage: Int,
#RequestParam(value = "order", defaultValue = "ASC") order: String,
#RequestParam(value = "orderBy", defaultValue = "tradeName") orderBy: String,
#PathVariable companyId: Long, #PathVariable active: Boolean): ResponseEntity<Page<Any>> {
val lp = service.findAll(page, linesPerPage, order, orderBy, companyId, active)?.let {
it.map { legalPerson -> legalPerson.toLegalPersonMPage() }
}
return ResponseEntity.ok().body(lp)
}