Kotlin Spring: Unresolved reference => copy

Question

I'm learning Kotlin and Spring and was developing mini project for learning experience. This function is for updating todo's which are already created/added and find it by Id and update the data. But I get Unresolved Reference: copy, and no documentation found.

fun putTodo(id: Long, newTodo: Todo): ResponseEntity<Todo> = todoRepository.findById(id).map { currentTodo -> val updatedTodo: Todo = currentTodo.copy( title = newTodo.title, status = newTodo.status ) ResponseEntity.ok().body(todoRepository.save(updatedTodo)) }.orElse(ReponseEntity.notFound().build())

Primož Ivančič · Accepted Answer · 2022-03-31 07:12:18Z

11

In order for copy() to exist, Todo must be data class.

answered Mar 31, 2022 at 7:12

Primož Ivančič

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Comments

AbirZayn · Accepted Answer · 2024-06-15 09:02:16Z

Posted on 15 Jun 2024. I just faced a same problem a while ago. For this private fun enterOperation(operations: CalculatorOperations) { if (state.number1.isNotBlank()){ state = state.copy(operation = operations)}} As I checked the state i have been referencing was not a data class therefore I changed the code and Its work.

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