[FEAT]: 게시글 좋아요순 정렬 조건 추가

back/src/main/java/com/back/domain/post/controller/PostController.java

@@ -4,6 +4,7 @@
 import com.back.domain.post.dto.PostRequest;
 import com.back.domain.post.dto.PostSearchCondition;
 import com.back.domain.post.dto.PostSummaryResponse;
+import com.back.domain.post.enums.PostSortType;
 import com.back.domain.post.service.PostService;
 import com.back.domain.user.entity.User;
 import com.back.global.common.PageResponse;
@@ -14,7 +15,9 @@
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 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.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
@@ -52,9 +55,14 @@ public ResponseEntity<PostDetailResponse> createPost(
     public ResponseEntity<PageResponse<PostSummaryResponse>> getPosts(
             @Parameter(description = "검색 조건") @ModelAttribute PostSearchCondition condition,
             @Parameter(description = "페이지 정보") Pageable pageable,
+            @RequestParam(defaultValue = "LATEST") PostSortType sortType,
             @AuthenticationPrincipal CustomUserDetails userDetails) {
         User user = (userDetails != null) ? userDetails.getUser() : null;
-        Page<PostSummaryResponse> responses = postService.getPosts(user, condition, pageable);
+
+        Sort sort = Sort.by(Sort.Direction.DESC, sortType.getProperty());
+        Pageable sortedPageable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(), sort);
+
+        Page<PostSummaryResponse> responses = postService.getPosts(user, condition, sortedPageable);
         return ResponseEntity.ok(PageResponse.of(responses));
     }
 

back/src/main/java/com/back/domain/post/enums/PostSortType.java

@@ -0,0 +1,15 @@
+package com.back.domain.post.enums;
+
+import lombok.Getter;
+
+@Getter
+public enum PostSortType {
+    LATEST("createdDate"),
+    LIKES("likeCount");
+
+    private final String property;
+
+    PostSortType(String property) {
+        this.property = property;
+    }
+}

back/src/main/java/com/back/domain/post/repository/PostRepositoryCustomImpl.java

@@ -4,12 +4,16 @@
 import com.back.domain.post.entity.Post;
 import com.back.domain.post.enums.PostCategory;
 import com.back.domain.post.enums.SearchType;
+import com.querydsl.core.types.Order;
+import com.querydsl.core.types.OrderSpecifier;
 import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.core.types.dsl.PathBuilder;
 import com.querydsl.jpa.impl.JPAQuery;
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.data.support.PageableExecutionUtils;
 import org.springframework.stereotype.Repository;
 import org.springframework.util.StringUtils;
@@ -32,7 +36,7 @@ public Page<Post> searchPosts(PostSearchCondition condition, Pageable pageable)
                 .where(getCategoryCondition(condition.category()),
                         getSearchCondition(condition.keyword(), condition.searchType()),
                         excludeHiddenIfSearch(condition.keyword(), condition.searchType()))
-                .orderBy(post.createdDate.desc())
+                .orderBy(toOrderSpecifier(pageable))
                 .offset(pageable.getOffset())
                 .limit(pageable.getPageSize())
                 .fetch();
@@ -80,4 +84,23 @@ private BooleanExpression excludeHiddenIfSearch(String searchKeyword, SearchType
         }
         return post.hide.eq(false);
     }
+
+    private OrderSpecifier<?>[] toOrderSpecifier(Pageable pageable) {
+        if (pageable.getSort().isEmpty()) {
+            return new OrderSpecifier[]{post.createdDate.desc()};
+        }
+
+        return pageable.getSort().stream()
+                .map(order -> {
+                    Order direction = order.isAscending() ? Order.ASC : Order.DESC;
+                    String property = order.getProperty();
+
+                    return switch (property) {
+                        case "createdDate" -> new OrderSpecifier<>(direction, post.createdDate);
+                        case "likeCount" -> new OrderSpecifier<>(direction, post.likeCount);
+                        default -> new OrderSpecifier<>(direction, post.createdDate);
+                    };
+                })
+                .toArray(OrderSpecifier[]::new);
+    }
 }