인프런 커뮤니티 질문&답변

다음과 같이 코드를 했는데 24강까지 애플리케이션에서 잘 삭제되고, 잘 저장되었는데 25강이후 코드는 실행되는데 '나이'가 입력을 해도 00세로 나오고, 목록에서 삭제하려고하면 '서버내부 오류입니다'라고 뜹니다.

아래 질문에서 쉬운거는 편집된게 있다고 하는데

배우는단계에 있는 사람으로써는 그렇게 편집되면 많이 당황스럽네요...ㅜㅜㅜㅜㅜ

어디서 틀렸나요?ㅜㅜ

UserResponse

package com.group.libraryapp.dto.user.response;

import com.group.libraryapp.domain.user.User;

public class UserResponse {
    private long id;
    private String name;
    private Integer age;

    public UserResponse(long id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public UserResponse(User user) {
        this.id = user.getId();
        this.name = user.getName();
    }

    public UserResponse(long id, User user) {
        this.id = id;
        this.name = user.getName();
        this.age = user.getAge();
    }

    public long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public Integer getAge() {
        return age;
    }
}

User

package com.group.libraryapp.domain.user;

import javax.persistence.*;

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id = null;

    @Column(nullable = false, length = 20, name = "name")
    private String name;
    private Integer age;

    protected User() { }

    public User(String name, Integer age) {
        if (name == null || name.isBlank()) {
            throw new IllegalArgumentException(String.format("잘못된 name(%s)이 들어왔습니다.",name));
        }

        this.name = name;
        this.age = age;

    }

    public String getName() {
        return name;
    }

    public Integer getAge() {
        return age;
    }
    //User class
    public Long getId() {
        return id;
    }

    public void updateName(String name) {
        this.name = name;
    }
}

UserRepository

package com.group.libraryapp.domain.user;

import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {
    User findByName(String name);
}

UserController

package com.group.libraryapp.controller.user;

import com.group.libraryapp.dto.user.request.UserCreateRequest;
import com.group.libraryapp.dto.user.request.UserUpdateRequest;
import com.group.libraryapp.dto.user.response.UserResponse;
import com.group.libraryapp.service.user.UserServiceV2;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController

public class UserController {

    private final UserServiceV2 userServiceV2;

    public UserController(UserServiceV2 UserServiceV2) {

        this.userServiceV2 = UserServiceV2;

    }

    @PostMapping("/user")
    public void saveUser(@RequestBody UserCreateRequest request) {
        userServiceV2.saveUser(request);
    }

    @GetMapping("/user")
    public List<UserResponse> getUsers() {
        return userServiceV2.getUsers();
    }

    @PutMapping("/user")
    public void updateUser (@RequestBody UserUpdateRequest request) {
       userServiceV2.updateUser(request);
    }

    @DeleteMapping("/user")
    public void deldteUser (@RequestParam String name) {
       userServiceV2.deleteUser(name);
    }
}

UserServiceV2

package com.group.libraryapp.service.user;

import com.group.libraryapp.domain.user.User;
import com.group.libraryapp.domain.user.UserRepository;
import com.group.libraryapp.dto.user.request.UserCreateRequest;
import com.group.libraryapp.dto.user.request.UserUpdateRequest;
import com.group.libraryapp.dto.user.response.UserResponse;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class UserServiceV2 {

    private final UserRepository userRepository;

    public UserServiceV2(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public void saveUser(UserCreateRequest request) {
        User u = userRepository.save(new User(request.getName(), request.getAge()));
        //System.out.println(u.getId());
    }

    public List<UserResponse> getUsers() {
        return userRepository.findAll().stream()
                .map(UserResponse::new)
                .collect(Collectors.toList());
    }

    public void updateUser(UserUpdateRequest request) {
        User user = userRepository.findById(request.getId())
                .orElseThrow(IllegalArgumentException::new);
        user.updateName((request.getName()));
        userRepository.save(user);
    }

    public void deleteUser(String name) {
        User user = userRepository.findByName(name);
        if (user == null) {
            throw new IllegalArgumentException();
        }
        userRepository.delete(user);
    }
}

 UserCreateRequest

package com.group.libraryapp.dto.user.request;

public class UserCreateRequest {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public Integer getAge() {
        return age;
    }
}