[HG]feat(#246): add boards on tag res dto

src/main/java/com/handong/cra/crawebbackend/board/repository/BoardRepository.java

@@ -31,4 +31,6 @@ public interface BoardRepository extends JpaRepository<Board, Long> {
 
     List<Board> findByTags_Name(String tagName);
 
+    Page<Board> findByTags_IdAndDeletedFalse(Long tagId, Pageable pageable);
+
 }

src/main/java/com/handong/cra/crawebbackend/tag/controller/TagController.java

@@ -1,10 +1,15 @@
 package com.handong.cra.crawebbackend.tag.controller;
 
+import com.handong.cra.crawebbackend.board.domain.BoardOrderBy;
+import com.handong.cra.crawebbackend.board.dto.PageBoardDataDto;
+import com.handong.cra.crawebbackend.board.dto.response.ResPageBoardDto;
+import com.handong.cra.crawebbackend.exception.board.PageSizeLimitExceededException;
 import com.handong.cra.crawebbackend.tag.dto.request.ReqCreateTagDto;
 import com.handong.cra.crawebbackend.tag.dto.request.ReqUpdateTagDto;
 import com.handong.cra.crawebbackend.tag.dto.response.ResTagDto;
 import com.handong.cra.crawebbackend.tag.service.TagService;
 import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
@@ -20,6 +25,9 @@ public class TagController {
 
     private final TagService tagService;
 
+    @Value("${spring.data.page.MAX_PER_PAGE}")
+    private Integer MAX_PAGE_SIZE;
+
     @GetMapping
     public ResponseEntity<List<ResTagDto>> getAllTags() {
         return ResponseEntity.ok(tagService.getAllTags());
@@ -34,8 +42,23 @@ public ResponseEntity<Map<String, Object>> searchByTagName(@RequestParam String
     }
 
     @GetMapping("/{id}")
-    public ResponseEntity<ResTagDto> getTagById(@PathVariable Long id) {
-        return ResponseEntity.ok(tagService.getTagById(id));
+    public ResponseEntity<ResPageBoardDto> getTagById(
+            @PathVariable Long id,
+            @RequestParam(required = false, defaultValue = "0") final Long page,
+            @RequestParam(required = false, defaultValue = "10") final Integer perPage,
+            @RequestParam(required = false, defaultValue = "0") final Integer orderBy,
+            @RequestParam(required = false, defaultValue = "true") final Boolean isASC
+    ) {
+        if (perPage > MAX_PAGE_SIZE) {
+            throw new PageSizeLimitExceededException();
+        }
+        final PageBoardDataDto pageBoardDataDto = PageBoardDataDto.builder()
+                .page(page)
+                .perPage(perPage)
+                .orderBy(BoardOrderBy.values()[orderBy])
+                .isASC(isASC)
+                .build();
+        return ResponseEntity.ok(ResPageBoardDto.from(tagService.getTagBoardsById(id, pageBoardDataDto)));
     }
 
     @PostMapping
@@ -56,4 +79,4 @@ public ResponseEntity<Void> deleteTag(@PathVariable Long id) {
     }
 
 
-}
+}

src/main/java/com/handong/cra/crawebbackend/tag/service/TagService.java

@@ -1,6 +1,8 @@
 package com.handong.cra.crawebbackend.tag.service;
 
 import com.handong.cra.crawebbackend.board.dto.ListBoardDto;
+import com.handong.cra.crawebbackend.board.dto.PageBoardDataDto;
+import com.handong.cra.crawebbackend.board.dto.PageBoardDto;
 import com.handong.cra.crawebbackend.project.dto.ListProjectDto;
 import com.handong.cra.crawebbackend.tag.domain.Tag;
 import com.handong.cra.crawebbackend.tag.dto.request.ReqCreateTagDto;
@@ -16,6 +18,7 @@ public interface TagService {
     ResTagDto updateTag(Long id, ReqUpdateTagDto dto);
     void deleteTag(Long id);
     List<ListBoardDto> getBoardsByTagName(String tagName);
+    PageBoardDto getTagBoardsById(Long tagId, PageBoardDataDto pageBoardDataDto);
     List<ListProjectDto> getProjectsByTagName(String tagName);
     List<Tag> getOrCreateTagsByNames(List<String> tagNames);
 }

src/main/java/com/handong/cra/crawebbackend/tag/service/TagServiceImpl.java

@@ -1,6 +1,9 @@
 package com.handong.cra.crawebbackend.tag.service;
 
+import com.handong.cra.crawebbackend.board.domain.BoardOrderBy;
 import com.handong.cra.crawebbackend.board.dto.ListBoardDto;
+import com.handong.cra.crawebbackend.board.dto.PageBoardDataDto;
+import com.handong.cra.crawebbackend.board.dto.PageBoardDto;
 import com.handong.cra.crawebbackend.board.repository.BoardRepository;
 import com.handong.cra.crawebbackend.exception.tag.TagInvalidNameException;
 import com.handong.cra.crawebbackend.exception.tag.TagNotFoundException;
@@ -13,9 +16,14 @@
 import com.handong.cra.crawebbackend.tag.repository.TagRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import com.handong.cra.crawebbackend.board.domain.Board;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
@@ -71,6 +79,31 @@ public List<ListBoardDto> getBoardsByTagName(String tagName) {
                 .toList();
     }
 
+    @Override
+    public PageBoardDto getTagBoardsById(Long tagId, PageBoardDataDto pageBoardDataDto) {
+        tagRepository.findById(tagId)
+                .orElseThrow(TagNotFoundException::new);
+        final Pageable pageable = getPageable(pageBoardDataDto);
+        final Page<Board> boards = boardRepository.findByTags_IdAndDeletedFalse(tagId, pageable);
+        return PageBoardDto.builder()
+                .listBoardDtos(boards.stream()
+                        .map(ListBoardDto::from)
+                        .filter(Objects::nonNull)
+                        .toList())
+                .totalPages(boards.getTotalPages())
+                .build();
+    }
+
+    private Pageable getPageable(final PageBoardDataDto pageBoardDataDto) {
+        final Map<BoardOrderBy, String> map = Map.of(
+                BoardOrderBy.DATE, "createdAt",
+                BoardOrderBy.LIKECOUNT, "likeCount"
+        );
+        Sort sort = Sort.by(map.get(pageBoardDataDto.getOrderBy()));
+        sort = pageBoardDataDto.getIsASC() ? sort.ascending() : sort.descending();
+        return PageRequest.of(Math.toIntExact(pageBoardDataDto.getPage()), pageBoardDataDto.getPerPage(), sort);
+    }
+
     @Override
     public List<ListProjectDto> getProjectsByTagName(String tagName) {
         return projectRepository.findByTags_Name(tagName)