// StudentRequestDto는 여러 필드를 포함
- name
- admissionYear
- majorName
- doubleMajorName

public class StudentRequestDto {
    @NotNull  // 새로운 필수 필드 추가
    private String phoneNumber;
    
    // 기존 필드들...
}

package com.kobe.schoolmanagement.dto.request;

import jakarta.validation.constraints.NotBlank;
import lombok.Getter;
import lombok.NoArgsConstructor;

@Getter
@NoArgsConstructor  // JSON 역직렬화를 위한 기본 생성자
public class UpdateStudentNameRequestDto {

    @NotBlank(message = "이름은 비워둘 수 없습니다.")
    private String name;
}

@PatchMapping("/change/student/name/{studentId}")
public ResponseEntity<StudentResponseDto> changeStudentName(
    @PathVariable String studentId,
    @RequestBody StudentRequestDto requestDto  // 범용 DTO 사용
) {
    return ResponseEntity.ok(studentService.updateStudentName(studentId, requestDto));
}

import com.kobe.schoolmanagement.dto.request.UpdateStudentNameRequestDto;

@PatchMapping("/change/student/name/{studentId}")
public ResponseEntity<StudentResponseDto> changeStudentName(
    @PathVariable String studentId,
    @RequestBody @Valid UpdateStudentNameRequestDto requestDto  // 전용 DTO + 검증
) {
    return ResponseEntity.ok(studentService.updateStudentName(studentId, requestDto));
}

@Transactional
public StudentResponseDto updateStudentName(String studentId, StudentRequestDto requestDto) {
    Student findStudent = studentRepository.findByStudentId(studentId)
        .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 학생입니다."));

    findStudent.updateStudentName(requestDto.getName());

    return StudentResponseDto.fromEntity(findStudent);
}

import com.kobe.schoolmanagement.dto.request.UpdateStudentNameRequestDto;

@Transactional
public StudentResponseDto updateStudentName(String studentId, UpdateStudentNameRequestDto requestDto) {
    Student findStudent = studentRepository.findByStudentId(studentId)
        .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 학생입니다."));

    findStudent.updateStudentName(requestDto.getName());

    return StudentResponseDto.fromEntity(findStudent);
}