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feat: getting a specific post backend

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sBubshait 2025-07-24 10:17:52 +03:00
parent 638ce4ee30
commit 8adb57af8a
5 changed files with 209 additions and 0 deletions
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29
backend/src/main/java/online/wesal/wesal/controller/PostController.java
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@ -7,6 +7,7 @@ import online.wesal.wesal.dto.ApiResponse;
import online.wesal.wesal.dto.PostCreateRequestDTO;
import online.wesal.wesal.dto.PostLikeRequestDTO;
import online.wesal.wesal.dto.PostResponseDTO;
import online.wesal.wesal.dto.PostWithLikesResponseDTO;
import online.wesal.wesal.entity.Post;
import online.wesal.wesal.service.PostService;
import online.wesal.wesal.service.UserService;
@ -184,4 +185,32 @@ public class PostController {
return ResponseEntity.status(500).body(ApiResponse.error("Something went wrong.. We're sorry but try again later"));
}
}
@GetMapping("/get")
@Operation(summary = "Get post by ID", description = "Get a specific post by ID with all liked users (limit 100)")
public ResponseEntity<ApiResponse<PostWithLikesResponseDTO>> getPostById(
@RequestParam Long id,
Authentication authentication) {
try {
if (id == null || id <= 0) {
return ResponseEntity.badRequest().body(ApiResponse.error("Valid post ID is required"));
}
PostWithLikesResponseDTO response = postService.getPostById(id);
return ResponseEntity.ok(ApiResponse.success(response));
} catch (RuntimeException e) {
String message;
if (e.getMessage().contains("Post not found")) {
message = "Post not found";
} else if (e.getMessage().contains("User not found") || e.getMessage().contains("Creator not found")) {
message = "Authentication error. Please log in again.";
} else {
message = "Something went wrong.. We're sorry but try again later";
}
return ResponseEntity.badRequest().body(ApiResponse.error(message));
} catch (Exception e) {
return ResponseEntity.status(500).body(ApiResponse.error("Something went wrong.. We're sorry but try again later"));
}
}
}

43
backend/src/main/java/online/wesal/wesal/dto/LikedUserDTO.java Normal file
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@ -0,0 +1,43 @@
package online.wesal.wesal.dto;
import online.wesal.wesal.entity.User;
import java.time.LocalDateTime;
public class LikedUserDTO {
private String id;
private String displayName;
private LocalDateTime likeTime;
public LikedUserDTO() {}
public LikedUserDTO(User user, LocalDateTime likeTime) {
this.id = String.valueOf(user.getId());
this.displayName = user.getDisplayName();
this.likeTime = likeTime;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getDisplayName() {
return displayName;
}
public void setDisplayName(String displayName) {
this.displayName = displayName;
}
public LocalDateTime getLikeTime() {
return likeTime;
}
public void setLikeTime(LocalDateTime likeTime) {
this.likeTime = likeTime;
}
}

95
backend/src/main/java/online/wesal/wesal/dto/PostWithLikesResponseDTO.java Normal file
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@ -0,0 +1,95 @@
package online.wesal.wesal.dto;
import online.wesal.wesal.entity.Post;
import online.wesal.wesal.entity.User;
import java.time.LocalDateTime;
import java.util.List;
public class PostWithLikesResponseDTO {
private String id;
private CreatorDTO creator;
private String body;
private String likes;
private String comments;
private boolean liked;
private LocalDateTime creationDate;
private List<LikedUserDTO> likedUsers;
public PostWithLikesResponseDTO() {}
public PostWithLikesResponseDTO(Post post, User creator, boolean liked, List<LikedUserDTO> likedUsers) {
this.id = String.valueOf(post.getId());
this.creator = new CreatorDTO(creator);
this.body = post.getBody();
this.likes = String.valueOf(post.getLikes());
this.comments = String.valueOf(post.getComments());
this.liked = liked;
this.creationDate = post.getCreationDate();
this.likedUsers = likedUsers;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public CreatorDTO getCreator() {
return creator;
}
public void setCreator(CreatorDTO creator) {
this.creator = creator;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
public String getLikes() {
return likes;
}
public void setLikes(String likes) {
this.likes = likes;
}
public String getComments() {
return comments;
}
public void setComments(String comments) {
this.comments = comments;
}
public boolean isLiked() {
return liked;
}
public void setLiked(boolean liked) {
this.liked = liked;
}
public LocalDateTime getCreationDate() {
return creationDate;
}
public void setCreationDate(LocalDateTime creationDate) {
this.creationDate = creationDate;
}
public List<LikedUserDTO> getLikedUsers() {
return likedUsers;
}
public void setLikedUsers(List<LikedUserDTO> likedUsers) {
this.likedUsers = likedUsers;
}
}

3
backend/src/main/java/online/wesal/wesal/repository/PostLikeRepository.java
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@ -22,4 +22,7 @@ public interface PostLikeRepository extends JpaRepository<PostLike, Long> {
@Query("SELECT pl.postId FROM PostLike pl WHERE pl.userId = :userId")
Set<Long> findAllLikedPostIdsByUserId(@Param("userId") Long userId);
@Query("SELECT pl FROM PostLike pl WHERE pl.postId = :postId ORDER BY pl.createdAt DESC")
List<PostLike> findByPostIdOrderByCreatedAtDesc(@Param("postId") Long postId);
}

39
backend/src/main/java/online/wesal/wesal/service/PostService.java
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@ -1,6 +1,8 @@
package online.wesal.wesal.service;
import online.wesal.wesal.dto.LikedUserDTO;
import online.wesal.wesal.dto.PostResponseDTO;
import online.wesal.wesal.dto.PostWithLikesResponseDTO;
import online.wesal.wesal.entity.Post;
import online.wesal.wesal.entity.PostLike;
import online.wesal.wesal.entity.User;
@ -155,4 +157,41 @@ public class PostService {
return new PostResponseDTO(post, creator, isLiked);
}
public PostWithLikesResponseDTO getPostById(Long postId) {
// Get the post
Post post = postRepository.findById(postId)
.orElseThrow(() -> new RuntimeException("Post not found"));
// Get the creator
User creator = userRepository.findById(post.getCreatorId())
.orElseThrow(() -> new RuntimeException("Creator not found"));
// Get current user to check if they liked the post
User currentUser = userService.getCurrentUser();
Long currentUserId = currentUser.getId();
boolean isLiked = postLikeRepository.existsByPostIdAndUserId(postId, currentUserId);
// Get liked users (limit 100) with their like timestamps
List<PostLike> postLikes = postLikeRepository.findByPostIdOrderByCreatedAtDesc(postId);
List<PostLike> limitedPostLikes = postLikes.stream()
.limit(100)
.collect(Collectors.toList());
// Get user IDs for batch fetch
List<Long> likedUserIds = limitedPostLikes.stream()
.map(PostLike::getUserId)
.collect(Collectors.toList());
// Batch fetch users
Map<Long, User> usersMap = userRepository.findAllById(likedUserIds).stream()
.collect(Collectors.toMap(User::getId, user -> user));
// Create LikedUserDTO list
List<LikedUserDTO> likedUsers = limitedPostLikes.stream()
.map(postLike -> new LikedUserDTO(usersMap.get(postLike.getUserId()), postLike.getCreatedAt()))
.collect(Collectors.toList());
return new PostWithLikesResponseDTO(post, creator, isLiked, likedUsers);
}
}