Refactor GetPost and ListPosts logic to use time.Time for timestamps; convert to Unix milliseconds and improve error handling

app/internal/logic/getpostlogic.go

@@ -31,6 +31,7 @@ func NewGetPostLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetPostLo
 func (l *GetPostLogic) GetPost(req *types.GetPostReq) (resp *types.GetPostResp, err error) {
 	var post types.GetPostResp
 	var coverID sql.NullInt64
+	var createdAt, updatedAt time.Time
 
 	// Query post with cover image
 	query := `
@@ -39,7 +40,7 @@ func (l *GetPostLogic) GetPost(req *types.GetPostReq) (resp *types.GetPostResp,
 		WHERE p.id = $1
 	`
 	err = l.svcCtx.DB.QueryRowContext(l.ctx, query, req.PostId).Scan(
-		&post.PostId, &post.Title, &post.Content, &post.CreatedAt, &post.UpdatedAt, &coverID,
+		&post.PostId, &post.Title, &post.Content, &createdAt, &updatedAt, &coverID,
 	)
 	if err != nil {
 		if err == sql.ErrNoRows {
@@ -50,6 +51,14 @@ func (l *GetPostLogic) GetPost(req *types.GetPostReq) (resp *types.GetPostResp,
 		return nil, err
 	}
 
+	// Convert timestamps to Unix milliseconds
+	post.CreatedAt = createdAt.UnixMilli()
+	post.UpdatedAt = updatedAt.UnixMilli()
+
+	// Convert timestamps to Unix milliseconds
+	post.CreatedAt = createdAt.UnixMilli()
+	post.UpdatedAt = updatedAt.UnixMilli()
+
 	// If cover image exists, get its URL
 	if coverID.Valid {
 		coverQuery := `SELECT file_key FROM files WHERE id = $1`
@@ -72,9 +81,5 @@ func (l *GetPostLogic) GetPost(req *types.GetPostReq) (resp *types.GetPostResp,
 		}
 	}
 
-	// Convert timestamps to Unix
-	post.CreatedAt = post.CreatedAt * 1000 // Convert to milliseconds if needed
-	post.UpdatedAt = post.UpdatedAt * 1000
-
 	return &post, nil
 }