[Practice] 게시판 API 만들기 (4)

1. 문제

• 게시판 타입의 목록을 리턴하는 API

 

 

 

2. 풀이

- BoardService.java

package com.example.jpa.sample.board.service;

import com.example.jpa.sample.board.entity.BoardType;
import com.example.jpa.sample.board.model.BoardTypeInput;
import com.example.jpa.sample.board.model.ServiceResult;

import java.util.List;

public interface BoardService {

    ServiceResult addBoard(BoardTypeInput boardTypeInput);

    ServiceResult updateBoard(Long id, BoardTypeInput boardTypeInput);

    ServiceResult deleteBoard(Long id);

    List<BoardType> getAllBoardType();
}

- BoardServiceImpl.java

package com.example.jpa.sample.board.service;

import com.example.jpa.sample.board.entity.BoardType;
import com.example.jpa.sample.board.model.BoardTypeInput;
import com.example.jpa.sample.board.model.ServiceResult;
import com.example.jpa.sample.board.repository.BoardRepository;
import com.example.jpa.sample.board.repository.BoardTypeRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Optional;

@RequiredArgsConstructor
@Service
public class BoardServiceImpl implements BoardService {

    private final BoardTypeRepository boardTypeRepository;
    private final BoardRepository boardRepository;

    @Override
    public ServiceResult addBoard(BoardTypeInput boardTypeInput) {
        BoardType boardType = boardTypeRepository.findByBoardName(boardTypeInput.getName());

        if(boardType != null && boardTypeInput.getName().equals(boardType.getBoardName())) { // 동일한 게시판 제목이 있을 경우
            return ServiceResult.fail("이미 동일한 게시판이 존재합니다.");
        }

        BoardType addBoardType = BoardType.builder()
                .boardName(boardTypeInput.getName())
                .regDate(LocalDateTime.now())
                .build();

        boardTypeRepository.save(addBoardType);

        return ServiceResult.success();
    }

    @Override
    public ServiceResult updateBoard(Long id, BoardTypeInput boardTypeInput) {
        Optional<BoardType> optionalBoardType = boardTypeRepository.findById(id);
        if(!optionalBoardType.isPresent()) {
            return ServiceResult.fail("수정할 게시판 타입이 없습니다.");
        }

        BoardType boardType = optionalBoardType.get();

        if(boardTypeInput.getName().equals(boardType.getBoardName())) { // 동일한 게시판 제목이 있을 경우
            return ServiceResult.fail("수정할 이름이 동일한 게시판명 입니다.");
        }

        boardType.setBoardName(boardTypeInput.getName());
        boardType.setUpdateDate(LocalDateTime.now());
        boardTypeRepository.save(boardType);

        return ServiceResult.success();
    }

    @Override
    public ServiceResult deleteBoard(Long id) {
        Optional<BoardType> optionalBoardType = boardTypeRepository.findById(id);
        if(!optionalBoardType.isPresent()) {
            return ServiceResult.fail("삭제할 게시판 타입이 없습니다.");
        }

        BoardType boardType = optionalBoardType.get();
        if(boardRepository.countByBoardType(boardType) > 0) {
            return ServiceResult.fail("삭제할 게시판 타입의 게시글이 존재합니다.");
        }

        boardTypeRepository.delete(boardType);

        return ServiceResult.success();
    }

    @Override
    public List<BoardType> getAllBoardType() {

        return boardTypeRepository.findAll();
    }
}

- ApiBoardController.java

package com.example.jpa.sample.board.controller;

import com.example.jpa.sample.board.entity.BoardType;
import com.example.jpa.sample.board.model.BoardTypeInput;
import com.example.jpa.sample.board.model.ServiceResult;
import com.example.jpa.sample.board.service.BoardService;
import com.example.jpa.sample.notice.model.ResponseError;
import com.example.jpa.sample.user.model.ResponseMessage;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;
import java.util.List;

@RequiredArgsConstructor
@RestController
public class ApiBoardController {

    private final BoardService boardService;

    // 문제 1
    @PostMapping("/api/board/type")
    public ResponseEntity<?> addBoardType(@RequestBody @Valid BoardTypeInput boardTypeInput, Errors errors) {

        if(errors.hasErrors()) {
            List<ResponseError> responseErrorList = ResponseError.of(errors.getAllErrors());
            return new ResponseEntity<>(ResponseMessage.fail("입력값이 정확하지 않습니다.", responseErrorList), HttpStatus.BAD_REQUEST);
        }

        ServiceResult result = boardService.addBoard(boardTypeInput);

        if(!result.isResult()) {
            return ResponseEntity.ok().body(ResponseMessage.fail(result.getMessage()));
        }

        return ResponseEntity.ok().build();
    }

    // 문제 2
    @PutMapping("/api/board/type/{id}")
    public ResponseEntity<?> updateBoardType(@PathVariable Long id, @RequestBody @Valid BoardTypeInput boardTypeInput, Errors errors) {

        if(errors.hasErrors()) {
            List<ResponseError> responseErrorList = ResponseError.of(errors.getAllErrors());
            return new ResponseEntity<>(ResponseMessage.fail("입력값이 정확하지 않습니다.", responseErrorList), HttpStatus.BAD_REQUEST);
        }

        ServiceResult result = boardService.updateBoard(id, boardTypeInput);

        if(!result.isResult()) {
            return ResponseEntity.ok().body(ResponseMessage.fail(result.getMessage()));
        }

        return ResponseEntity.ok().build();
    }

    // 문제 3
    @DeleteMapping("/api/board/type/{id}")
    public ResponseEntity<?> deleteBoardType(@PathVariable Long id) {
        ServiceResult result = boardService.deleteBoard(id);

        if(!result.isResult()) {
            return ResponseEntity.ok().body(ResponseMessage.fail(result.getMessage()));
        }

        return ResponseEntity.ok().body(ResponseMessage.success());
    }

    // 문제 4
    @GetMapping("/api/board/type")
    public ResponseEntity<?> boardType() {
        List<BoardType> boardTypeList = boardService.getAllBoardType();

        return ResponseEntity.ok().body(ResponseMessage.success(boardTypeList));
    }
}